I've just bought the Casstrom Woodsman knife that was designed by Roger Harrington. I appreciate its not the same, but it is very similar in design apart from blade length (9cm) and thickness (4mm). Otherwise it's the same steel, same scales and same kind of sheath.
The point I'd make is that the Casstrom knives (on initial impressions) seem to be very impressive. It's very well made, shaving sharp and should have no troubles lasting a good lifetime of use. In my mind it's the best thing you can get if you're not wanting to fork out twice as much on a custom knife.