Since I've been in this hobby (about 6 years) the engines have always been the problem for me. The air frames, servo, batteries, switches are usually bullet proof. But the engines always give me some flack. Really I just want to fly. I put up with all the assembly to get out there and have fun. I learn a lot putting these things together but really I prefer to just charge, gas up and fly. That's what I'm hoping the rest of my flying season will be like once I get this latest DLE-55 in my Extra. The DL-50 in my Yak is totally dialed in.