I've had my AD700's for about two years, and have been pretty satisfied with them. The only reason I bought my second pair of cans (SRH440) was for office/LAN usage, while the AD700 holds down the fort back home. The comfort is quite nice, though I do find they get a bit sweaty during the summer months, but I would get that from any headphone honestly.
I do agree, the bass is a bit lacking especially compared to some decent closed headphones in the same price range, but I find the extra soundstage you get makes for quite a fun listening experience for certain genres of music. For electronic music, I guess it would be a bit lacking, but I usually only listen to prog rock, various kinds of metal, J pop and jazz, and they suite me just dandy.
For gaming of course, they are quite nice especially if the game has good audio design. I find the lack of bass is good for games because the added midrange and highs clarity makes picking out directional audio much easier.
The lack of clamping is a bit of an issue, but I have not really had that affect me during my gaming sessions, since the only movement I do is usually adjusting my posture once in awhile. I did have an issue with one of the wings becoming loose over time, but I just shot off an email to Audio Technica's customer support and they mailed me a new wing at no charge. I was very happy about that!