I ordered an M1 Mini, after advice from Apple phone sales staff that I would be able to use my late 2012 iMac with it in target display mode, with a Thunderbolt-3 to Thunderbolt 2 adapter. Wouldn’t work. After two conversations with tech support, I was told the M1 Mini is incompatible with Intel-based iMacs. Had to send it back. Sales staff now admits they misinformed me. So, now I wait, for my refund, and to see which M1-based machines come out next.