I'm running Elixer 5's with 203mm rotors and like them, they've easily seen over 60k vertical feet in the last year with no problems - I'm actually still on the stock pads although the fronts are nearly worn down now. I only weigh 160lbs or so and I'm not a brake dragger, though.
I took my friends bike with the 2012 XT brakes out for a test spin and was impressed at the power - I think these will be my next brake set.
Interestingly enough I had an old set of Hayes HFX-9's that I swapped on temporarily for a dozen rides or so, I fully expected that after years of running Juicy 7's, Codes and other "high quality" brakes the performance would be terrible. I was quite surprised to not notice a single damn difference. I've been riding since the days of canteliever brakes so it's all relative I guess.