is this a good deal? never had a NAS.
Yes these are good. thing to know about Nas boxes and Raid. if the main boards fail in your name brand Nas box it may be hard or impossible to recover. so this is what we do. When we have a Nas box we buy two setups. so if the main Nas box fails we have the same version hardware/OS/firmware. either that or you wil have to send the box to the manufacturer for recovery. A perfect example is the Drobo. I think they are slow but they are almost a siple plug and play and totally hot swappable
If I wanted reliability I would build my own Nas box, just my 2 cents