I put about 50 miles a week on mine, commuting and riding around. After the internals were replaced, there was a break-in period of maybe 4 weeks when there was a lot of noise and it felt like the pawls were sometimes engaging both gears at once. During this time braking and shifting were crisp and strong.
After that, the popping and grabbing diminished, and there were about 7 or 8 golden weeks of great shifting and strong braking.
Since the "golden period", braking has become weaker and shifts require a firmer push back on the pedals, sometimes so much that I miss a shift.
I still like it. Like the concept. Don't think the quality is quite there. Would hesitate to recommend it to anyone who is not interested in fooling around and just wants stuff to work.