Mine is a 2010, and I love it.
Three things annoy me though.
1) I can't leave it in the accessory position for more than maybe 5 minutes without getting a warning of low battery. Doesn't seem right, but dealership says it is what it is.
2) Bluetooth doesn't work with my particular cell phone. No explanation available. GM's website says it has been validated and works. My experience is different. GM says testing is imperfect and doesn't catch everything. Again, it is what it is.
3) The USB iPod interface with the radio doesn't display the entire content of the iPod. Seems there is a space/content limitation in that interface, and I exceed it with too much content on my iPod.
But the Yukon drives great, performs great, tows great, is spacious and comfortable.