Jay,
I have a pair of 10 x 42s. They're the only bins I've owned, so can't compare them with others on a long term basis. I did once use them side by side with a top of the range Zeiss pair and they were similar, albeit the Kahles lost some colour definition a bit quicker than the Zeiss pair.
In terms of comparison with scopes, my bins tend to run out of light slightly sooner than my scope, which is an 8 x 56 Hungarian S&B. If I can see it through the bins I know I'll be able to see it through the scope and hence a shot is still on. The scope lasts about another 5 mins (depending on conditions), so that's a good way round for me.
Overall, I've been pleased with em and have not felt the urge to buy a pair of Swaro's (yet) although can't guarantee that I never will.
Cheers,
Bob