I've (like Spiff) have made purchases from Audiogon.
My Axiom EP125 and NAD C541i to be exact. Both are in PERFECT condition and I've loved every minute of having them. The NAD was 2 months old and the EP125 was sold by Canadian HiFi. I'll admit that Audiogon isn't as organized as ebay or ubid etc. but as long as you use some good judgement you can get some AWESOME deals. Also, many items are from small audio shops. My NAD was $280 (including FREE overnight shipping) from a small personal vendor. He even e-mailed me to make sure that I was enjoying the CDP. Basically, watch for these kind of deals.

Good luck