Keep in mind people post stuff on forums mainly WHEN things don't work right. You'll barely see a thread titled "Hey...I have 25k on my Denali without a single issue". The amount of new Yukon's I've started seeing on the roads (and at my work in the parking lot), tells me GM is selling these really well and there are a LOT of satisfied owners out there but you won't find these people on internet forms to get feedback
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Yes..we are putting on miles on ours and LOVE the truck. We considered used Escalate, Mercedes, Lexus GX and Landcruiser and eventually went with the Denali. Couldn't get in with Infinity's weird shape of their truck.
ZERO regrets. Even if the vibration is there, we haven't noticed yet (and neither have my friends/families that have driven the truck as well). ONLY minor issue we had was the stock headphones for the e/t unit wouldn't work from day one but once dealer exchanged the set, the replacement headphones worked fine.
PS: Going to Lake Tahoe for my nephew's bachelor party this weekend so looking forward to the snow driving!!!