I had one but hated it. Sold it to get an iBook G4.
It performs fine, but keep in mind that it's really not built very well, they have a high defect rate, and, as on the old CRT iMacs, if you play audio using the internal speakers it causes ripples and major screen distortions on account of the powerful magnets ******* with the CRT. It's also very big and bulky weighing 50lbs and a ***** to move because its made of smooth plastic, which gets very slippery, and there are no handles. Also, if you get it, you're going to want to get the tilt-n-swivel stand so you can adjust the viewing angle, and that's another 50 bucks. ONLY get it if you can't afford anything better, that's the absolute only reason why anyone who isn't an educational institution should ever consider getting an eMac.
Oh yeah, keep in mind, unlike most Macs which have fabulous resale value, the eMac resale value is absolutely h o r r i b l e, you can see some selling on eBay with a 1GHz G4, superdrive, a gig of ram, etc... for like $600. You can find old G3 iBooks selling for more than that.
My advice: Wait until Apple updates the iMac line, and get one of those instead. It's bound to be a hell of a lot better machine, and look better too.