I have their 3-9 and it is very nice. The 10HD and the 5-20 is supposed to be even better than the 3-9. The fixed powers have also been upgraded and are supposed to be better than they used to be which wasn't all that bad to begin with.
Just so you know, I am not a guy that gets real into the whole glass quality, clarity, resolution thing. Not because I don't care but mostly because the glass in most all of today's medium to high end scopes are plenty good so to me glass is way down on the list of what should be important and mostly discussed in a scope.
Scope durability, turret repeatability, etc. features are much more important to me so I always make my purchasing decision based on those things first.
This site Home
has a ton or good reads on the SS scopes and many others. Also like mentioned previously, Jon A has a lot of experience with SS scopes and has many posts here, on the hide, and on optics talk that will be helpful in your search.