We had a couple at work and they seemed to run pretty hot. Luckily they live in the apps room so they're air conditioned. We've used them as temporary storage, user migrations and the like.

If you're after something to use as an all encompassing media server and don't mind spending more money then ReadyNAS, ReadyNAS, ReadyNAS. The best bit of Netgear hardware I've ever bought (even though it was made by Infrant).