Geez ... THREE WEEKS To Get a Pi5 From Amazon !

Pi 5 needs Bookworm if using Pi OS, Bullseye won't work.

DID get the thing yesterday and, confirmed, BullsEye won't work with it - you get a weird incompatibility message if you try to use Bull. So, looks like we're stuck with Wormy. 3rd-parties will port their distros over of course, but I still think the RPos is likely the "best tuned" to all the features on the board.

Did get to use the new dedicated fan connector (they HID it with a little cover - had to read the text on the board to find the thing).

Interesting quirk ... on the initial set up the wi-fi connections did not show. Appeared at the first "real" boot however. So, could not do "update during install" but had to do it manually later.

It IS a snappier board than the Pi4 ... you can feel the diff. Not a HUGE diff, but you can tell. Once US prices drop a bit, I'll buy at least one more. Been using a 4 as a security-cam server (with 'motion') and it WILL handle six cams at 1-fps no problem ... but I may add cams, or want to speed up to a slightly higher frame rate).