Ditto what Kirby said.
I have SSs in 10 and 16X. I find the quick focus diopter thinger very helpful also. It's pretty much a must have for these ol' eyes. Not all scopes have it.
They track very very well. But the turrets need to be cleaned and re siliconed when you first get it otherwise the clicks are stiff. I recleaned and siliconed mine again @ 4 below zero.