I built mine last winter and flew it more than any other plane last summer. I found the instructions very good, material good and had no problems with construction. Covered it with Monokote I had left over from other planes, powered it with a Thunder Tiger 15. I beefed up the wing at the bends slightly with extra music wire and 1/16 ply. I had to add 3 3/4 oz. nose weight and have a 6 oz tank that gives me half hour flights. As their instruction manual cautions, this is a "powered sailplane" and should be flown as such. It's not designed as a stunt plane. It's a relaxing plane, easy to fly (I usually hand launch per book instructions) and great for just crusing around looking for thermals. If you want to really exercise your heart and nervous system, leave the Butterfly home and take a TF P-47 or Corsair to the feild.