I also run them on my street trials bike: In my experience they feel absolutely awesome and i was very impressed with the performance. However for me the rear brake started leaking oil two times already. Maybe this is because my rinding isn't as smooth as Ali's rinding...
On the topic of customer service: I ordered them through a good shop, therefore I got a new brake delivered within a few weeks. Nothing bad to report here
I still have to send in my other brake, but I hope everything goes smooth as well.
In the end I will probably only run a hayes brake on the front, as modulation is perfect and run a different brake on the rear. At least for my riding (maybe a bit to harsh, still learning though) they are probably not fit for purpose.
