We were lucky in that Stripe was made available right as we were starting http://www.ginzametrics.com. We never had to deal with the painful issues that we've seen other companies go through with their billing systems.

Their dashboard has also come a long way so that many of the back office management things I thought I was going to have to build have been taken care of. You can create / manage plans, customers and more. It's hard to believe nobody has solved this problem until now but I'm glad that somebody finally did.