I'm a 6', 60 kg beanstalk so it's hard to find a boat that fits! However in the RX I feel solid as a rock. I can do the big stuff (upper dart, various austrian/alpine rivers & going to Norway soon) and can still flat spin and surf on the river and in the sea. I have seen people throw ends like there's no tomorrow in it but have yet to master it myself. The only slight problem I've found is the foot rests which are a bit hard to get in the right place and to make them stay. However this is probably down to myself being stupid rather than the boat! Over all a super boat and great fun (only reason it doesn't get 5 stars in everything is cause nothing is perfect).