Question I have is does having studded tires eliminate the need for chains especially on steep passes?
No. I love studded tires, I think the mechanical grip offers something beyond the Blizzak/other "studless technology" tires - but in reality, a studded tire is not really NOTABLY better than a Blizzak/other good quality studless snow.
I've had both "studless" winter tires and studded, I keep going back to studs. I've never studded my own tire - someone on here went crazy with a stud gun and put 700ish studs in an all-terrain tire - I'm sure that's FAR more significant than normal studded snows, but even then, I doubt they'd compare to chains.
Drew - remember when we pulled that Subaru out of the bank (well, through the bank for a bit....oops) on 40? Remember how icy the road was? That's where I REALLY like studs.
But chains...that's a whole extra level of grip. 2wd vs 4wd in the average truck is pretty dramatic, right? 4wd with snows vs 4wd with chains is not AS dramatic - but it is close. Chains are ridiculous.
I've never needed to chain up a 4wd vehicle on public roads to get there, FWIW. I always have decent tires, but still - I've never NEEDED chains on main roads, and CO rarely (I've never seen it) mandates chains on passenger vehicles.
I just got a set of Nokian Hakkepeliita LT2s for my truck, they seem good. Not FANTASTIC, but good. IME, the Cooper Discoverer M&S is the best bang for the buck (studdable, square tread blocks). They're awesome.
.02c! I'm a tire junkie.