iMac G3s, unlike the eMacs, are veritable tanks.
Workhorses. I like them. Get a cheap slot load, put in a new faster hard drive and max up the ram, you can run Tiger better than you'd think.
I just talked to someone today, as matter of fact, who has an eight year old iMac G3, she says it is still great and her main computer.
I know about seven people with them still running fine.