I also appreciate the input and the things I learned from reading all these posts.
I installed mine today in my non-Bose 2020 LTZ. When I found this truck a couple of weeks ago I didn't care that it didn't have Bose or nav. I wasn't impressed with the Bose on my 2019 although previous trucks I've had w/Bose sounded OK.
Install was no big deal, I used to install avionics many years ago. The part that sucked was tapping into the little plug that was tucked way out of the way. It took me most of the afternoon, mainly because I was trying to find out why there was an extra plug. I'm glad I checked the switches, 2 and 3 were down. I put all 6 up. After I finished it and fired it up I wasn't impressed. I moved the switches to 1-5 up and 6 down and it was much better. I also installed a bass control knob.
It sounds pretty good to my aged ears. I listened to some Stones, Led Zeppelin, Doors, and other fine tunes from days gone by and I'm pleased.