I have a Predator X. It flys great. The cg is very important as is the elevator (elevon) travel. You can give it lots of aileron travel but a little elevator goes a long way. I was thinking about getting a Panther but putting an os46fx on it and using it in open class, but I haven't talked to Tufflight yet about what they think about it. My Pred X screams with the os46fx on it, just imagine it on the smaller Panther. By the way, my Pred X has flown right thru everything in it's path so far with only covering scratches for damage.