I own the same one and it sits across the room in an open cabinet under the TV. I can hear it if everything else is off, including the ceiling fan, the windows are closed, and I focus. It really is quiet enough unless you plan to put it on your desk. Mine has been running for nearly 3 years now non-stop and I think the fan is starting to go. It does seem to have a bit more of a noise than before. I plan to replace the fan with a Noctua. Temperatures according to S.M.A.R.T. are well within spec so no worries there.
However, the 212J is discontinued I believe. Unless you are getting it super cheap on a closeout, you might as well jump up to the 214 series. Faster processor, more memory, better performance. It depends on what you plan to do with it I suppose. Mine is basically a music server, time machine backup, and photo archive. It works fabulously as such.