I think it's going well - I've got no complaints about it. There have been a few issues with stations not locking/docking properly but so far the wholesale vandalism/theft/rivers of blood haven't happened and the bikes do seem to be in regular use.
The only problems I'm aware of have been software related: rogue journeys showing up on people's accounts; docking stations not processing requests; the TfL map not being accurate on whether there are bikes/stations available.
I am however a complete newbie with regards to any form of serious cycling so I'm not the best person to ask about whether the bikes themselves are any good. They seem fine, though heavy, to me.
Awesome!