The QNAP TS-439 has a lot of great features going for it. For a 4 drive NAS device which really is a computer optimized for storage purposes, it doesn't have a huge footprint. The black front with gun metal aluminum chassis gives it a very sleek and professional look, definitely meant for the office or a network, tucked away in a network cabinet. Unlike the TS-809 Pro that I reviewed earlier, the TS-439 comes complete with eSATA ports to increase your capacity by an additional 2 drives.