This builds really easy if you follow the directions. I'm not a glider person, so I put a motor on it, and it performs magnificently! I have often put it up in a gentle breeze and been able to keep it aloft for 30 minutes to an hour just with a little power at a time. With a 3S 2200' I use it as a trainer for my kids and newbie pilots. It is gentle and docile, and forgiving for new pilots. It does need some speed at that weight to keep air moving over the control surfaces, but it teaches them speed management as well. Excellent plane!