hey grasshopper i am a 4rt man and have bin for the last 2 years ever scince they arrived on the trials scene... and never looked back! the first 3 months were actually hard as i found it difficult to get to grips with it as i was riding a rev3 but once that stage was over it was clear this bike was it! i think a lot of riders dont give the 4rt a chance as a large con is when you loose grip is it very difficult to regain it. the trick i find to overcome this is to get a 3 stage clutch which allows you to slip it helping you to get better drive. a big pro for the 4rt is the sheer power the engine can deliver. a con i would say is its weight... the 4rt is the heaviest of all modern trials bikes which is why is is not suited to young riders. but if you need any reasurance on the performance of these bikes just look at who is the current indoor champion and what bike he rides.