Not to put too fine a point on it, but it seems to me that buying an Odyssey (used of course) these days is also buying the opportunity to spend more money (a lot more in some cases) on a coma corrector, wide field eyepieces, a convenient focuser (if the original hasn't already been replaced) or a 2 inch focuser if you want wide angle views, a better mirror cell, a secondary spider that can be straight forwardly adjusted, and, quite possibly repairs or tweaks to the mount or at the very least, bigger altitude bearings. Whenever I think about buying one, I flash back to the picture that someone posted of a Paracor II and an Ethos in a red Odyssey 13.1 fitted with a much better after market focuser. So, that is $1200 worth of glass in a $300 scope, plus the improved focuser, and I come to my senses that there are probably better, or at least more efficient ways to spend $1500 on a telescope and eyepieces.
I think that most people value the larger Odysseys as a cheap source of largish mirrors and you see a lot of 13.1 inch and 17.5 inch truss scopes that must have started life as an Odyssey. You see few Odysseys for sale in original and good shape and more than occasionally one that says the mirror has been refigured and mounted in a better cell. That tells me something. You can buy a used "modern" dob for not much more than an Odyssey.
Still, there is a red 8 inch for sale in CO, whose price has been dropping every two weeks....