One thing I will say though is that on the group rides I've been on over the last 3 years at least 4 times someone has had a gear failure issue that traced back to discharged batteries (although at least one of them was SRAM - which is a bit less serious because they have two batteries and can be swapped).
For me that isn't a reason not to get them, but it's a reason to be a bit less careless about battery charging
The thing I don't quite get is why it's so expensive, when the components are basically the same as you have in an average RC plane...
A couple of servos
A microcontroller
Transmitter/Receiver (or wired buttons)
Battery/ies
If I had a dev bike I'd be tempted to have a crack at rolling my own.