My dad's one seems to work great with Tiger and the 256 MB module in addition to the built-in 64 MB - the Beigey with 640 MB does feel faster still, but then that has a better CPU and graphics card too. Depends what you're going to be doing on the machine really (and also whether or not you're used to faster Macs, I reckon - G3s like that feel really fast to me but I think that's partly because I don't have access to any newer Macs to feel the difference).