They're just all Korean imports. He doesn't do anything with them. He got bought out then run off of his own company Dean, then he started DBZ guitars and apparently he was run off from there too, now it's just him doing Korean imports under Dean Zelinsky.
There is something about him showing that he is next to impossible to work with, I wouldn't hold too much stake into these guitars.
I played a Tagliare Standard with Z-Glide yesterday. (Did a setup and minor repair for the guy who is selling it.) The neck has a good feel as far as width and fret spacing, and the body is comfortable, but the Z-Glide neck is a total turnoff. It's supposed to reduce drag, but IMO it just makes the drag worse.