Those are the reasons - if ever I replace my 8-voice Poly Evolver - it will be with a Summit. That's clear for me. And the reason I don't yet have a Rev2 is that every time I get the money, a little financial disaster comes along and steals it. I can't tell you how many times this has happened. So, as the price of a Rev2 has climbed, I've had to turn to less expensive stuff. Hence, the Odyssey.
I haven't soured on the Odysseys yet; I've just realized they're no substitute for a Prophet '08 in Unison mode. Maybe contrary to you and others, I find the P'08 to double as a superb mono synth. There are always a few idiosyncrasies to deal with, but they can be partly resolved with a little ingenuity. And the fact that, using Split mode, you can have two different monophonic patches simultaneously available from the one keyboard, means you have much more than just a nice long keyboard.
Rather than throw my arms up and sell the Odysseys, it seems as if I should experiment a bit more to try to get the most out of them. My main objective, though, is still to get either a second Prophet '08, or else, a Rev2. Always so close, and yet so far.
As an aside, I like to think of my Hammond pedalboard controlling a P'08 module, combined with a P'08 keyboard coupled with a P'08 module, all topped off with a pair of Korg ARP Odysseys and a MIDI keyboard or two, as comprising one heck of an ARP Quadra!