To be quite honest, it's actually my favourite regulated mod!
It's really well made, has a nice display and it just works. I have a whole bunch of other single 20700/21700 mods, but for some reason this is the one I grab most often.
Only real downside with it would be, that the top is beveled down on the edges and anything over 24mm goes over that beveled edge. It's really not that noticeable with a 25mm atomizer, but I would not use it with anything bigger than 25mm with 24mm or below fitting best. But that should not really end up being a problem for MTL.