The motor on the Tower Trainer 40 RTF is OK but not great. Also the radio could be a little better (like the radio on the Nexstar RTF). Here again if you think you can handle the assembly work or get some help with it I'd recommend going the ARF route and pick your own radio/engine combo. Assembling an ARF really isn't very hard. Read and follow the manual carefully and ask questions from friends or here instead of GUESSING when in doubt.
Here's the manual for the Tower ARF so you can decide if you can handle it: http://www.towerhobbies.com/products...1110manual.pdf