I did the UR as my second plane. For some reason I will never understand, I didn't have any problems with the URs?? I built all 40s and loved them. For my main power I used the OS .46 LA engines. I did try other engines over the years but none of them flew the plane any better. I never flew 3-D though. Dumbest engine I installed in one was the MDS .58 for me to say over kill is saying something but it was!! The 60 is just bigger so if you have old eyes then it's a good choice. Most the time I would say no for a second plane, it's a fun fly plane and can be flown crazy but I did it? There are a lot better choices for a second plane though.