Im using one right now cos me iMac G5 is still installing OSX again...
Same specs just the 20" version, gotta be honest it's fine for browsing the web but don't expect to be able to watch live video or any kind of online videos to be honest, it's more like watching a slidsehow than a video...
Browsing is pretty slow unless you use an adblocker to get rid of all those annoying flash ads, fit a bigger HD 80GB is useless on the thing go for at least 160GB...
Most stuff stuff runs quite well but not as fast as the iMacG5 and you'll need to upgrade from 10.2 to 10.4.11 (don't pay someone 300 quid to upgrade it though, boy was I ripped off)...
The main reason for upgrading to 10.4.11 is that most of the software you be running on it requires this, it's almost impossible to fin old 10.2 versions now and they are really naff if you do find them...
If you wanna know anymore send me a PM and I'll help you out...
PS: it's PPC and makes a great desk lamp...