TC Blades gyutos are heavy, in your face, solid, gyutos with a "virtual single bevel", as I call it. The micro bevel is more like a regular bevel on a laser (small, but definitely there). The bevel on the other side, however, is done just like any single bevel knife. It creates a very different feeling gyuto, but they really are worth experiencing. I like mine quite a bit (and I' sayin this, not as a vendor, but as a member, since I don't have his gyutos on my site).
As for what makes a "single bevel gyuto" different than a deba. In my opinion, that's blade thickness, no ura and much less upsweep at the tip. That's just my opinion.