Hello Arrio, we just got ours flyin. We have an OS 91 FX in it with combo of HS605's and 2 JR 537's on ele. I like to have plenty of juice on our 3D planes so We have a 1400 MAH 6 volt flat pack in it which helped to balance it out well by putting the batt right in front of the servo tray. We ran pull pull on rudder with a 605 on the tray. Flew real well on our test flt sunday - it was cold and windy and it locked into a hover real well and did all other basic manuvers well. Did not try any real hard 3D yet , so ??? Loks good so far - lands very slow and easy too. It may be a keeper ! Have FUN , Rod & Chris in PA.