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I was sold on the expandability. Simply add SANbloc S50 JBODs for up to 30 tb (or 60 tb? it's a little confusing). Now one NAS device can manage all my storage for many years to come.

Don't forget that you still need to back this thing up. If you're doing anything involving striping your data across multiple drives then you're actually increasing the chance of losing data due to a failure.

Expandability whilst nice shouldn't be your main focus. In a couple years time, those HDs you've got in there are going to be tiny. I bought a 1 TB Buffalo Terastation NAS a couple years back and already now you can buy a single SATA drive that is 1TB for way less.