Just finshed building my trex 500. Very easy and straight forward model to build. Canopy is a little close to the forward swashplate links, but nothing a dremal can't sort out. Frames are simple and seem soilid with very low parts count. Tail belt is a little thin however testing by the guys on this forum shows good results so far. Head is a mini 600 head with all the ballraces in the correct places. Lets hope the cyclics are a liitle faster than the stock 600. Concerned about this bec problem, ...