Much to my suprise this build combined with Efaw motors and Helio Spring FC flies spectacular. I can fly this heavy weight 405 grams w/o battery balls out for 4 minutes straight without a hitch of any bad behavior. Throttle inputs are nice and smooth, these motors have the ability to send you into the stratosfere in quite a hurry. The Marmotte built with the right components will certainly bring many years of flying enjoyment, because afterall if you break it they replace it. The Armattan frames are by far some of the best on the planet. If you don't believe me get one for yourself and see. Once you experience the exquiste design craftsmanship, and careful selection of materials used in their frames you will be hard pressed to back to anything else! These frames are made to fly hard!!