I have been riding an electric skateboard through Copenhagen for a few years (Evo 600: http://en.evo-skate.com/street600wood/). We have great bicycle tracks all over the city which is ideal. The principle of the board is the same, board strapped with an electric motor, controlled by IR remote in the hand. I'll share a few thoughts.
First off, my board has a 600 watt motor and does around 20mph, which is fast in the city. I overtake most bicycles (people's faces are priceless). I cannot fathom what a 2000 watt motor would do, seems kind of life-threatening honestly. I haven't had any accidents, flew over the top a couple of times when I hit a high edge, par for the course when skateboarding, but I wouldn't want to go any faster.
My board does around 10 kilometers per charge, which is enough for a commute in the city. Not sure how well a 2000 watt motor would fare, I definitely could not accept less range. But my board has the older SLA battery, a lithium battery probably evens the score, while being lighter.
How easy is it to drive? You need experience skateboarding or you'll have quite a learning curve. The accelleration needs a good stance to not get dropped off the back, same with breaking vs. flying over the front. Turning is even more cumbersome than with a real skateboard because the board is so heavy, so you need pretty good technique (and space).
About safety: If you fall off, drop the remote etc. the board stops, the IR must be in your hand to activate and has a short range either way, so no chance of the board running away from you. As soon as you stop accellerating the board slows right down, and you can brake with the engine too (big advantage over a real skateboard). The engine is engaged all the time so you can't just roll like on a real board. Hopefully these guys solve this problem, would be useful if you're out of battery.
About sound, it's not annoying but not quiet either, your regular medium-sized electric motor. In the street it's not particularly noticeable.
About legal issues: It's illegal in the street but no one cares. I pass patrol cars all the time and most don't notice that it's not a regular skateboard, or don't care.
On motor power, note that the power rating of a motor is usually the maximum continuous power the motor is rated for, ie without overheating. Just because a motor is 2000W as opposed to 600W, doesn't necessarily mean it will use any more power for a given job it is being asked to do. Your 600W motor could produce 2000W too if you were to nearly double the voltage, but it might overheat. Regardless, the power they draw is the power asked of them. For example, your skateboard might be 200W continuous when travelling at a constant velocity, and both motors in this case will only use 200W, or rather a bit more because they're not perfectly efficient. Which brings me on to efficiency. Different kinds of electric motors have different characteristics, but it's usually the case that they will have a maximum efficiency at a lower power than maximum power. The designers of this skateboard might have chosen their 2kW motor such that it is operating at maximum efficiency at the power they are expecting it to need to produce to propel humans around. In this respect the range of the 2kW skateboard might actually be greater than the 600W skateboard, everything else being equal.
That said, 2kW is a lot of power! If all that could be instantaneously put down without wheel spin by a skateboard, I image it would shoot out from under your legs like a bullet out of a gun. Fun!
Regarding the dangerous speeds that a 2kW motor could propel you to, the full 2kW might only be used when going uphill. At 100% efficiency, 2kW will let a 75kg person travel at 10 meters/s [1] (sprinting speed) on a 15% incline.
As a cyclist, 15 deg incline is steep. Honestly, steeper than all but rural roads and even then rare. There might be some hills like that in SF. Even in the mountains, graded switchbacks are not nearly that steep, for the most part.
Which beings me to who and why would you want to ride down something so steep on a skateboard? I have a hill a mile from my house, thats ~200 vertical feet, and a around a 1/4 mile, its 12 degrees max on my GPS topo. I'm easily 35-45 mph on this, coasting. No hands descent would be NFW. 40 mph on a skateboard and there is a piece of gravel on the road, I'm not sure a Helmet will even help you with the face-plant potential.
But other than that, I think for a flat city it may be of interest. Or even a flat-ish area like soma/mission. But Manhattan? Nah. I'd pass. Maybe in the sub-urbs or exurbs? Where its just a long slog down a random road to the store or whatever would be more interesting. There is a lot of sprawl out there. And this would be cooler than a segway =D.
Yes, with stop signs =D. And Cable car Tracks. And Cross-traffic. LOL.
Bottom line = 30 degrees is sketchy, even ATGATT, on a Motorcyle.
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[Edit] Citaton: Just how steep is this?
A large avalanche in Montroc, France, in 1999, 300,000 cubic metres of snow slid on a 30° slope, achieving a speed of 100 km/h (60 mph). It killed 12 people in their chalets under 100,000 tons of snow, 5 meters (15 ft) deep. The mayor of Chamonix was convicted of second-degree murder for not evacuating the area, but received a suspended sentence.
Regarding the speed, the website says it's artifically limited, so I don't think you'll see these flying around at ridiculous speeds. It sounds like just included the beefy motor to power up San Francisco hills.
Here in Portland I think the laws would go unenforced for electric bicycles like in Copenhagen. I can't imagine any cop pulling someone over who isn't doing something stupid.
And laws can be changed. If these travel at roughly bicycle speeds, in bicycle right-of-ways, let's regulate them like bicycles, not cars.
I doubt it is an IR remote. Infrared is too directional. Virtually all wireless electric skateboard remotes use RF, typically in the 10-100 MHz range. My electric skateboard remote even has little aluminum pads on the handle in order to use the rider's skin/body as an antenna (!)
First off, my board has a 600 watt motor and does around 20mph, which is fast in the city. I overtake most bicycles (people's faces are priceless). I cannot fathom what a 2000 watt motor would do, seems kind of life-threatening honestly. I haven't had any accidents, flew over the top a couple of times when I hit a high edge, par for the course when skateboarding, but I wouldn't want to go any faster.
My board does around 10 kilometers per charge, which is enough for a commute in the city. Not sure how well a 2000 watt motor would fare, I definitely could not accept less range. But my board has the older SLA battery, a lithium battery probably evens the score, while being lighter.
How easy is it to drive? You need experience skateboarding or you'll have quite a learning curve. The accelleration needs a good stance to not get dropped off the back, same with breaking vs. flying over the front. Turning is even more cumbersome than with a real skateboard because the board is so heavy, so you need pretty good technique (and space).
About safety: If you fall off, drop the remote etc. the board stops, the IR must be in your hand to activate and has a short range either way, so no chance of the board running away from you. As soon as you stop accellerating the board slows right down, and you can brake with the engine too (big advantage over a real skateboard). The engine is engaged all the time so you can't just roll like on a real board. Hopefully these guys solve this problem, would be useful if you're out of battery.
About sound, it's not annoying but not quiet either, your regular medium-sized electric motor. In the street it's not particularly noticeable.
About legal issues: It's illegal in the street but no one cares. I pass patrol cars all the time and most don't notice that it's not a regular skateboard, or don't care.