Interesting question. I`m sure there are as many opinions as there are RC pilots. Can someone ( such as myself ) ascend to the intermediate level if he/she is happy flying BASIC aerobatics with a 4*40 or simply enjoying a nice day flying their semi-scale PT-19 low and slow on fly-bys just to enjoy the way it looks? OR, does it take moving up to the " hotter ", more nimble and unstable aerobatic aircraft and " pushing the envelope" successfully?