I'll definately go with the Echo Pure if I were you and wanted to do trials for real. I am buying Yaabaa (and this model specifically), because it is cheap, durable and it is also suited for riding from place to place. If you want to ride trials and be good at it - Echo. Anyway, I've heard that KOXX's (which is the company behind Yaabaa/TryAll/...) prices are a little high for the quality. So, definately not the Yaabaa (not this 599 one, anyway). I'd also recommend Czar if you have the funds. When I buy the bicycle, I'll give some more comments about it here (and some photos probably).