I Got 1 of these pups, I love it. I have a Saito 1.80 with a17x5 prop. Hi Tech 5625 digitals all round. Had to add 1/8" plywood blocks behind left side of motor mount to correct torque efect from large engine. Also used Dubro's four stroke anti vibe mount. Had to modify firewll a bit but very little. I used 6 volt nimh and placed it on the tray behind the canopy. Balanced just ahead of the rear top wing mount bolt. Flys great, unlimited verticle performance, lands like a dream with just a smidge of throttle. I replaced the stock aileron linkage with 4-40 rod and ball links. (what a difference, no slop at all now.) All in all, my favorite bird to date.