If you are in the market to expand your storage capabilities, whether it be via your NAS (like myself), or your PC, the Teratrend TS431U may be the solution to fit your needs.
While the unit is meant to be racked next to servers and workstations, it does offer a second option with the included rubber feet. The build quality of the unit was rather superb, with both the aluminum front panel, and steel frame construction. The finishing touches, like the built-in drive activity LEDs that are blue when idle, and turn purple when the drives are working, are also excellent.
Performance of the unit was quite good; our sample was able to touch 250 MB/s read and write in RAID 0. Latency results were equally as impressive, especially with sequential workloads where we started under 1ms, and peaked near 18ms at QD32.
Pricing of the Teratrend RS431U, at the time of writing, sits at $368.99, and comes with a one-year warranty from Teratrend.