I bought 3 of these things and returned 2 before I finally figured out what was going on.  My initial assessment was that they were all DOA and wouldn't boot.When I plugged the box in and hooked it up to the monitor I expected to see the display from a Mac that had booted into the Mac user interface.  Instead all I got was a puzzling image of what looked like a mouse, alternating with a keyboard.  Since the MacMini has excellent Bluetooth I expected to be able to use my BT mouse and / keyboard to supply whatever input is needed.Silly, silly me.  In fact you need to attached a wired input device (mouse or keyboard) to get it to complete the boot sequence and start asking the user ID questions.  Without the wired input device it remains a dumb piece of silicon, plastic and aluminum capable of little more than lighting up a monitor.I finally went out to CVS (who uses a wired mouse these days?) and purchased a cheap mouse that attaches to MacMini USB port.  Then it completed the boot sequence and everything (included BT & Wifi) started working swimmingly.So how good is the computer?  I haven't really had a chance to check it out yet.  All I can say is that I have no reason to doubt the rave reviews all the M1 Macs have received from. people far better equipped to evaluate than I.But if you do purchase this machine, make damn sure you have a wired mouse.And that 3 star review is just a compromise between the 0 stars I'd give to for the weeks long struggle to boot the damn thing, and my relatively brief experience since I've had it up and running.