The mSR is very stable for a single rotor bird, but it is a lot faster in foward and reverse flight. It is also more responsive as well. It is the "hot rod" of E-Flite's ultra micro fleet. It is pretty easy to fly if you have mastered the mCX but if you decide to go crazy on the sticks, it will get out reach very quickly. And is has an adjustable swashplate setting (you move the control links to another set of control balls) that makes it even more aggressive. You won't be dissapointed IMHO!