I installed Robbie Groves brakes on my O320 Long over 200 hours and a year ago and haven't done ANYTHING except visual inspections since. Recommend them highly. I did abuse them landing at Reno, NV one day with pax, 3/4 fuel and a Boeing 737 on final looking at my Hertzler prop! We got off early, heavy braking and no problems.
The "No Problems" part is what I like best!