Only just caught up with that video and kinda impressed with what they've done. I think if I was buying a MiSTer now I'd seriously consider one. Even the cheaper £204 unit would probably work for me (although you have to buy a PSU, or bring your own). I imagine it'll have solid availability, UK-made and hopefully good support if things go wrong. My only gripe although I understand it; is the 3D printed cases are ugly.
I have to be honest I haven't switched on the MiSTer in a while now, been too busy with other things so I can imagine I'm way behind on cores, AmigaVision and their X68000/DOS setups. Probably going to lose an afternoon updating it.
I really wanted to support these great guys but im not willing to have that ugly 3D printed box on display. I hope they can somehow in the future injection mould something.