Welcome to the new and improved Proflex / K2 Tech Forum!
The only reason to buy one of these is if you wanted to keep an older K2 orginal. Something to think about if you want a true retro bike. Personally, I like mixing the old with the new. That's why my next project is to put a swinger air shock on my 856's crosslink. I just have to design and machine an adaptor to compensate for the difference in eye to eye length and to provide a little clearance for the air valves.
That is my old fork!! Crazy, I sold to him in Nov. and he's already parting with it.
Right now I'm more worried about too much travel. I have a 200 mm shock in the drawer right now and am planning on using it. I've looked at Andrews (FrankD3000) setup and he used a much shorter shock with a long adaptor. I think you are correct about him not liking the fork. If you look at his gallery (the old one), he switched to a Manitou fork three months later. I am looking at making adapters similar to jazclrints design where he installed a Fox Talas 200mm shock on the front of his crosslink. http://www.flickr.com/gp/16675643@N08/5HG0QK He had a short discussion thread about this back in October last year. Unlike Andrew, I think he has been riding this Fox shock set up for a while. Great minds must think alike. I have two Noleen Mega Airs. One on my Haro FS and one on my son's bike. Great performing fork with a stupid simple design and easy maintenance. It'll be a sad day when they finally wear out.