Hi, guys. I've had the ds710+ for a while now and I'm very pleased with it. I have it mounted with 2 samsung 2tb disk, but I've now ran out of disk storage. I've considered the dx510, but the price doesn't justify it. The price here in Norway is 600 $ for dx510 and 790 $ for ds412+.
The ds412+ got two usb 3.0 so you can basicly connect two external drives that works just as fast as an internal? Same goes to the e-sata port.
DS710+ / DSM 4.1 -2647 / DX-513
40/40 Mbit fibre optics