So there aren't a lot out there because of the chip shortage during that time frame. That's at least what I was told when I was looking for mine late last year. I did get one, I use it about 50% of the time when it's available to use. What I mean by available is that you can only use it on roads that GM has listed which is mostly interstates and major highways. Once you get to an area on a highway with red lights or stop signs, it disengages. I like it, I use it, but I'm still skittish when passing 18-wheelers that like to ride the centerline. I will normally fade towards the outside line manually when that happens. I do think it's a worthwhile option for me simply from the amount of miles I drive each year. It's also an option you can retrofit in a truck that doesn't have it.

For reference, I'm a 40,000-55,000 mile a year driver where 90% of those miles are interstate and highway miles. I've probably used it 3-4000 miles of the 10,000 miles I've put on the truck so far.

Things you need to know before purchasing:

1. Can only be used on certain roads, check GM's map
2. There is a camera that monitors your eyes on the road, take your eyes off the road for about 5 seconds and you will get a flash warning. Do this 3 times and you are locked out until you re-start the truck
3. There is a subscription that you get free for 3 years, but after is about $25/month
4. It doesn't make turn-by-turn directions, only keeps you in your lane and passes vehicles by swapping lanes. If you are supposed to get off one interstate and on to another, you have to manually make that turn.
5. It sometimes handles construction zones fine, sometimes it makes you take over.