I have a few Larue mounts I got as part of an optic purchase, but I don't like their mounting system much and wouldn't buy the mount standalone.
I tend to like ADM for QD mounts. For non-qd Geissele is good. Especially back in "normal" days when you could get them at a discount during holiday sales.
I don't like Bobro because it's "too sophisticated", in my opinion, and the levers tend to stick out quite a bit.
The downside of unity fast mount system - your magnifier must be used with their mounts only. You can't simply take a magnifier in a unity mount and put it on a rifle with an optic in a different mount because the magnifier sits directly in line of lower third mounted optic, when folded down.
One solution that I saw for people that need ultra high red dots:
buy a riser and then mount the red dot/magnifier on a riser. In the future, if you have a rifle with more traditionally mounted red-dots, simply moving the magnifier will allow you to use it on that rifle.