My 2014 High Country. Owned it about 4 months now. Had 6700 miles when I bought it, 15,000 now.
Having owned a 2007 Sierra SLE2 and a 2007 Tahoe LT3, each with the 5.3L, I have to say I love *love* the 6.2L motor.
My wife's 2010 Suburban has the 5.3L as well, and I have to say the difference is still massive. The extra power is significant.
I will also say I'm kind of disappointed in the internal cabin space of the Silverado. The F150 feels a lot roomier - hell my 07 Sierra felt a lot roomier, and it had bucket seats in front too. The Silverado rear seats also feel a bit tighter with less legroom than the F150 or my buddy's Tundra.
But the rest of it is awesome. Interior, features, stereo...even the mileage is decent, with 15-16 city and 20-21 hwy.