I saw many brothers using Picco and its is a great European engine, its easy to tune and fast. I think it should be a bit durable than OS. But it is a problem to choose/install manifold cause its special exhaust design.
Although seems that at similar price Picco performs better, I had a very very poor experience that the carb. of my new Picco 5+2 buggy engine "lock" at full speed (I think due to poor workmanship) and my RC8 run away wildy at full speed. Luckily my RC8 is not seriously damaged but the Picco screamed to death......if you choose Picco, check it carefully..........