I say $15 for 320 Gb, go for it. But with that being said, don't put anything important on it.
These refurbished HDD are always a roll of the dice, but offer a great value for an HTPC, or whatever you grandma checks Facebook on.
Quite a while back I bought 5 80Gb WD IDE drives. I received drives that were produced from 2002 up to 2008. I ran some SMART test on some of them that I set up in an Lubuntu machine for playing around with free Linux games. (An old HP Pentium 4 SFF) One of the 5 disks was reporting 10 years of powered on time, but it is still working fine. It doesn't even make that much noise.