Here is a link to PatternReview.com. I actually found around 17 reviews on this machine. What is really nice about this site, is the reviews are from actual owners and they give you the good and bad about the machines. Hope this helps in your decision.
Looks like this was a very expensive machine when brand new...Good luck.
http://sewing.patternreview.com/SewingMachine/Viking
Also, you can review almost any machine out there on this site. It is very complete. I used it alot when I was looking for my new machine.