what's the difference between this version and the one selling for close to $2,000 on Gil Hibben's site?
Just about everything. The $90 one is merely a replica. I'd hesitate to even call it a knife, but rather a knife-shaped-object. Mass produced in a factory in China. Made from steel that polishes up nicely to look shiny, but doesn't perform like you would want knife to. The real Gil Hibben is a real knife, and handmade by a master craftsman. Gil Hibben is a bit of a dichotomy. His name is associated both with junk and masterpieces. The junk are mass produced Chinese "fantasy" knives, or replicas of his handmade work. Because of this, he is one of the very few knifemakers whose name is known by the non-knife enthusiast crowd. You see Gil Hibben designed pieces at the mall, in BudK catalogs, on TV late at night, etc. None of these are of any redeeming quality other than looking pretty on a shelf.
The other half of the dichotomy is that Gil Hibben himself is an incredible knifemaker. Many might know his name from the wall-hanger crap with his name on it, but those who really
know who he is know that knives that he actually makes himself are of great quality and command a impressive value as a collectors piece. Perhaps his best-known work is the Rambo III knife, original examples of which are
extremely valuable (as are the Jimmy Lile knives from "First Blood").
Perhaps the best real-world comparison I can make is that the Chinese made Gil Hibben knives are like a VW chassie with a fiberglass Shelby 427 body on it, compared to an actual Shelby made 427 with the original aluminum body. One is a representation made to look like something it's not, the other is the real deal. One is worth a few bucks, one is worth a fortune. One will barely get you around town, one is a race car. Buying the $90 and expecting it to do real knife-related tasks is foolish and a waste of $90. If you want a knife that can chop limbs off trees, field dress a deer, and slay zombies, you can find such a knife for around $90 or so, but the Gil Hibben ain't one of those.