i did that, and really wish i bought something , mostly because i have like 4 hhds just lying in the bottom of the case
Performance is great. I could do it because I was given those disks for free, with plenty of ours on each of them.
These days I managed to snag a deal on a Supermicro 846. I'm still settling into it, the main thing that concerns me is being able to suck enough air through the drive bays without making a lot of noise. My previous incarnation used some iStar toolless drive bays. I've learned to appreciate hot-swap bays, mainly for only having to do the cabling once.