I bought one of these before I found this site and I wish I had found this site first.
I paid about $285 Canadian for it and if you are going to build one for yourself, you can likely biuld two or three very nice stills fo rthat amount, including al the copper pipe you will need, as well as getting a good sized stainless steel pot to being to learn about this hobby.
I bought it, also the turbo yeast that they advertize with it; made my first wash and then cooked it.
Having nothign to compare it too, other than memories from 25 years ago, I though I had made soom good Hooch!!
However, all my friends and family who tasted it thought it was crap!!!
So I found this site, started reading and started to understand about making cuts, what foreshots, heads, hearts and tails were all about.
I also found that the volume on these "airstills" is jsut too small to really get anykind of a good product.
So I build my self a simple Bokabob fractioning still, did a proper DWWG sugar wash and a nice slow run
Talk about night and day. I got 92% ABV off my first run, and even my wife loved the stuff ( she really dosn't like scotch or burbon, or home-brew)