It's really great and a pretty decent step up from the previous model years. I owned 2 16s and an 18 (all 3 Yukon Denalis) and it's good to see them progress like they have with the technology. I have pretty much either had BMWs or GMCs the past few years and just came out of a 2017 X5 x50i M-Sport. Different beasts, no doubt, but I like how much more room I have. We have two labs, a 4-bike hitch mount tray carrier and a large Yakima cargo carrier so the Yukon will be much more suited for that. Love all of the cameras on it, especially the front cameras that automatically activate as you pull into a parking spot or closer to a bumper in a drive thru. The top down 360 cam also activates. The rear view mirror cam is solid as well. It's got 3 zoom levels on it and you can tilt the camera up and down from the mirror itself.
I am hardwiring my radar detector today and am going to try and figure out how to disable auto start/stop permanently. It's pretty annoying. In my X5, you could disable it for good until you enabled it again. The rear entertainment system looks nice but if I can't get any streaming content to them, they will go unused by my two daughters. Pulling a Fire Stick off of a TV in my house to try out and will tap into one of their 15gb hotspot connections.
It's a very quiet ride which I greatly appreciate. Not sure if you ever saw this or heard of these issues with previous models but I took a chance on the 2021, especially not driving it before I bought it. The bet seems to have paid off. https://www.autoguide.com/auto-news/2015/12/theres-a-big-issue-with-gms-suvs-and-no-one-seems-to-have-a-solution.html
I also created this group specific to these new SUVs. Check it out - https://www.facebook.com/groups/2021yukondenali/