I've had all-sorts over the years. But more recently can run direct comparisons between the Shimano MT520's Zee's M8120's + Magura MT5's and MT7's. Ignoring all the 2 pots for obvious reasons, and ignoring anything SRAM - I'd rather use Clarks M2's .
The more basic Shimano stuff seems to have a more consistent lever feel, M520's have no right to be as good as they are, powerful and consistent. The other Shimano stuff all suffered with wandering bite points, the rear M8120 was particularly bad. But this has been cured by using GPR6 as brake fluid (have a search it's well documented). Mineral oil holds dissolved air, and turns to syrup at low temps. Use the GPR6 and warm it before you bleed, pull a vacuume on the syringe before bleeding etc etc....
The MT5's were superb but the rear lever never felt quite as firm or consistent as the front. The MT7's were on a DH bike that got hammered and they were hands down the best brakes I've ever owned. Ultimate power, endless modulation, and were consistent pad after pad over 4 years and multiple bleeds.
Wow that’s brilliant feedback mate, so if it was your money you would be going for the 7’s then ….?