Yep, I have one. It's decent; I don't have a real UFS to compare, but it seems well built. It comes with a small build platform, not sure how to describe it, didn't use it; I'm using a killer 705 clone in it, and that works well. A bit fiddly to get it feeding well without draining all the
juice into the bottom well, but trial and error...
As to its utility - if for whatever reason you like using cartos, or k705's, it's a pretty nice solution - all the fun of a
tank for capacity, plus
juice feed control, plus air control. That said, I find myself using my genny-style rba's or my clone ithakas more often that I go back to the ufs.
It's also bloody huge - think ithaka stacked on top of an oddy. Tallest atty (or atty platform, whatever) I have. It makes me nervous for my 510 connectors, having it be so topheavy.