I'm currently fixing up a free MDD single 1.25Ghz for a friend, who had an iMac G5 1.6Ghz that died (dead caps and for once I don't think I can be bothered fixing). He was more than happy with that machine, so I think with this + more RAM + flashed Geforce 6800 he won't be looking back.
My wife also "downgraded" from a Intel Mac Mini (Core2Duo 1.83) to an iMac G5 2.1GHz 20" model; again while a little slower, she finds that it provides for a much a much nicer computing experience. Being one of the final G5s made, Office 2008 which is usually an absolute dog runs quite nicely on it. I haven't tampered with YouTube/Flash settings yet, but that seems OK too. She is stoked with it, and I get my Mac Mini back for turning into a HTPC
I'd still be using my G4 Cube hadn't I got into the Hackintosh scene, and was able to obtain some cheap PC parts for the process (which if you do your research for the most compatible parts, you can make a sweet machine for very little).
JB
My wife also "downgraded" from a Intel Mac Mini (Core2Duo 1.83) to an iMac G5 2.1GHz 20" model; again while a little slower, she finds that it provides for a much a much nicer computing experience. Being one of the final G5s made, Office 2008 which is usually an absolute dog runs quite nicely on it. I haven't tampered with YouTube/Flash settings yet, but that seems OK too. She is stoked with it, and I get my Mac Mini back for turning into a HTPC
I'd still be using my G4 Cube hadn't I got into the Hackintosh scene, and was able to obtain some cheap PC parts for the process (which if you do your research for the most compatible parts, you can make a sweet machine for very little).
JB