Don't know about the origins but I love my wood Twitch II. I have no blade play at all (some complain about this) and the assist is strong and positive. Lock-up is solid. The Wood is beautiful and the blade comes sharp and holds an edge fairly well.
The size was a bit small for my hands but a little lanyard resolved that. This is the only lock-back with a flipper I've ever seen, and SOG pulled it off well. I think the potential for blade play comes from the relationship between the pass-through lock bar and the tang. If those surfaces are not flat there is potential for some wiggle, but like I said, mine has no play.
The blade shape is simple and the knife as a whole is very elegant and business-appropriate.
Quite honestly my favorite feature is the shallow area over the lock bar where your thumb goes when using this knife. It's just a little shallow spot, but it really show's how much thought and attention to detail went into this design. It's the little things...
