It's funny, I was never that interested in eyefinity or the nvidia equivalent - the bezels put me off. Though lately when watching games on youtube, I can really see the appeal. I saw some dude play one of the Stalker games this way and it looked very good. I got so immersed in watching him play that I totally forgot about the divides between the monitors.
Ive yet to actually try it myself, i bought 3 22" benq screns from ocuk but somehow they shipped 2 22" and a 24". The 24" has just been picked up today so i assume over christmas ill have to make do with a pair of 22" and my hp 23" which has a pretty thick bezel. The benqs bezel seem pretty thin by comparison.