I could have sworn I had posted an interim update after this one, but I guess not. Well, yesterday afternoon I had the unit uninstalled and have started the process to (hopefully - not holding my breath) get a refund. Here are the downsides I discovered since this last update:
1. Both AM and FM radio no longer worked, for some reason. The buttons were still on the screen, but pushing them didn't do anything
2. I couldn't figure out any way to get the factory screen to show anything other than the Apple CarPlay interface UI. This is an issue, because the car uses that screen for adjusting just about everything adjustable on the car.
3. This was really the deal killer for me - the new unit was always electrically hot. I had no idea for the first week or so, until the battery was dead one morning. Discovered the Bluetooth and Wi-Fi connectivity was always there when within range while the car was off. Happened multiple times, the battery tested OK. Ended up having to hook up to a battery charger every evening and leaving it overnight for the better part of a week before I could get it uninstalled.
4. This just sealed my decision - absolute radio silence from the seller to address any of these technical issues. They were more than happy to answer questions prior to sale, but since then? Nada.
The tech at Best Buy/Geek Squad that did the uninstall (not the same guy that put it in) told me if he had been the tech assigned to the install he wouldn't have done it. They always see some sort of issue, either right away or not too long down the road. Chalking this one up to a caveat emptor lesson for me. I put the chances at even a partial refund in the single digits.
EDIT: Right after posting this, I decided to try their online chat feature on their website to see if I could get a response when they thought there might be another sale on the hook. Their website is down. FML.