I haven't found Agon's bluebook to be off by "multiples." At worst a lot of the stuff selling now, is usually at or 5% below the lowest recent sales. Not necesssarily but in many cases. I've bought and sold a few things and keep up with other equipment pretty closely and it really isn't that far off. I've got Mcintosh, Bel Canto, Aerial equipment and have owned and sold other brands (Dynaudio, Rega, Krell, Cary and so on) and it hasn't been off more than 5% or 10%. At worst it's a good starting point. I think one thing that's hurt it a little is the way sales work and feedaback work now.