The 50mm objective is a bigger target to get knocked around, and doesn't balance well on most medium to light rifles. Now if you're stand hunting it might be different.
Personally, I'd save the money and get a VX-1 3-9 x 40. I have VX1 and VX2 2-7's and darned little difference in the quality of view. Plus the VX-1's have the lock ring on the eyepeice.
