I'm currently wiring up my frame off resto right now, in fact I have a post a few down from this one with a minor problem I'm having now. I'm going through right now and getting everything working. As soon as I do that I'm going to remove the harness (again) and re-wrap the entire thing to make sure the wires are solid. Anything questionable at that point will be replaced.
My harness was/is in pretty tough shape. But, for the $250 those other companys want for a roll of wire and a fuse block? I would have to agree with the previous posts. I don't think it was so much the $$$, it was the fact that you would have probably more cut and splices than your original one would have if you decided to fix it. You would have to go through and solder all your ends onto the roll of wire you got from painless, centech, and ez-wiring anyway?