I just picked up a Tahoe HC last week. We put about 800 miles on it over Labor Day weekend. It is an awesome road trip vehicle and with the 6.2, it hauls! (considering its size)
A few minor issues that I've found with the Rear Seat Infotainment system...
One of the rear monitors stopped working. It went black and wouldn't respond to any input. I had to completely wipe the system via the front screen. It's worked fine ever since.
I can't for the life of me get my Andoid phones and tablets connected to the rear monitors via Miracast/WiFi-Direct. It just won't work.
Because of (2) I hooked up a Chromecast, which works great...until it doesn't. It's like the system/monitors stop detecting the HDMI signal. It takes a complete vehicle shutdown/reboot for it to detect it again.
While minor, the RSI was a $2k option, so I'd like for it to work reliably and how it should. Fortunately, I think the issues can be fixed via software updates. Fingers crossed.