Because it may get lost in the other thread, I'll double up on mentioning the issues I've had here.
Firstly my external SSD doesn't work in the rear USB ports. Its a Sabrent Nano 1TB SSD. In the rear ports it gets detected, but the PS5 is unable to format it. It works "fine" in the front USB C port.
Secondly, and this is why "fine" is in quotes. If the HDD is attached, then Miles Morales crashes to a black screen of death. I then have to use the front power button to restart the PS5, and it will then detect corruption and rebuild the internal SSD. It seems, but I've not repeatedly experimented, that it will not restart whilst the external HDD is still attached. Annoying as I really want the PS4 games on the external.
I also think it needs more USB ports, particularly on the rear. One for the Headset dongle, one for the PSVR camera, and one for the PSVR, one for the external HDD. I might have to try a USB hub for the dongle and the PSVR connections. I don't like having things permanently connected to the front, nor do I like having to swap things around all the time.
Other than that, its been great. Really enjoying Valhalla apart from the screen tearing. Would really love to get an OLED for gaming on, but I'd have to upgrade the main TV as well (otherwise SWMBO will kill me).