I agree you can't beat it for the money.. I only have a Q-52xl (E.I.) in mine and it does wonderfully. I will and have always given it a high mark. (building instructions were only weak link) I am toying with the idea of moving up to a better engine just for the heck of it, but it really doen't need it for IMAC and most 3-d style maneuvers (the ones I can do). I added a pic of my 27% and some of the 34% I have built to the bones in storage. It shows really how easy they are to build.