I'm very pleased with my Tahoe after 74k miles. No transmission issues but have had the ABS module go out twice. First time was under warranty and the second time I had it repaired for about $200 instead of the $1,200 the dealer wanted. Also came with a 5 yr warr instead of 12 month. The rest of the braking system is great, still on original pads and rotors. Plenty of power to tow trailer and people. And even thought gas mileage isn't great, it's better than what some Ford and Dodge owners I know are getting.
Love the cargo doors instead of the liftgate. Front row center seat is much more useful than the console it came with.