We've been super happy with The M-Link we bought from Brandt. Ive paid it off after a few months ( Started in Jan) and the low ink costs help us make good money with it.
Very reliable, easy maintenance, and good service. Easy-ish at first, DTG is a whole different animal. Lots of experimenting with pre treatment, and different things to get retail ready DTG. Most shops probably don't care about marks left by pretreatment and pressing, but our customers mainly put these products onto shelves so we have to make sure they looked good.
The only reason I even considered a DTG is M&R has been so good with all of our other printing equipment, that I know they would have good service. That been the case and the machine has been working smoothly after a few minor fixes.
Cant speak of the other brands, but Brandt did an extensive post on the Brother ( Non GTX) and this M&R and I can confirm most of what he said about the M&R machine.
Hope this helps!