I have a black edition which works well, a couple of negatives are the juice channels are smaller than they should be and caused some dry hits.
My fasttech version was a POS!
I also have an original kayfun mini which I bought after a few clones and I have to say, I don't think I'll buy any more clones!
The original just works so well and is so well built.
There are differences that you just don't see on first look, like the thickness of the positive post which broke on my FT clone, the size and shape of the post screw heads, the size of the juice channels, and just the quality of the fit and finish.