I built and flew a 'Sorta Tensor' for about 1 year and loved the thing to DEATH. It was awesome. I finally junked it and 6 months later purchased a real tensor 4d. Turns out. The production one flies like crap compared to my scratch built. Also weighs about .5oz more than my sorta. I suppose the weight gain could be to blame, but it doesn't feel like the same plane at all. Oh well.