I think they certainly work well for small scale acoustical sorts of music, maybe my taste in music is just too out of sync for them. I find myself trending towards more large, open, full, warm sounding material. Film scores, ambient, electronic, maybe a dash of big band and classical. The range of music I did like on them well enough on was just too small to justify keeping them, I wonder if people who love them are just focused on certain genres that the 650 just happens to works well with. If I found my perfect cans for $200-$300 I would be pretty excited as well!
Kind of worrying to hear about the afc soundstage, I've been looking for some well extended detail monsters that won't nuke my ears and they seemed interesting. I had a pair of er4xr's a while ago, amazing detail and fun, but my ears were just fatigued much too fast. They had almost no soundstage (good imaging though), which didn't actually bother me too much, so maybe that's not so much of a problem. I suppose I might just like my natural sounding cans to be big, warm, and full rather than more intimate and mid-forward. I don't think I'd mind a small soundstage on a more neutral, detailed, less "natural" can though.
Any sub-$1000 detail oriented cans that aren't grainy or fatiguing? I've been looking into the afc and lcd2's in particular