I just bought a pair of Pass X-600's. They are the best amplifiers I have ever owned. They are a significant improvement over my previous amps, the Pass Aleph 1.2 monoblocks in all areas with the exception of the midrange. In that area, I give the nod to the Aleph. I think the pricing of the 600's on the used market is more an indication of the state of the economy right now than anything else. Luxury items (and I consider audio a luxury item) are selling at lower than normal prices. Same thing can be said of expensive watches and cars. Prices are low because it is a buyers market.
Just my two cents worth.
Just my two cents worth.