Summary: Bought this on sale to house a pair of 7200 RPM drives. Setup was quick and easy. Not sure I trust the connector on port 0 of the SATA back plane, was seeing many timeouts during a Raid 0 remirror. Re-seated drives - problem went away.
Pros: Easy setup. Cheap (when on sale).
Cons: Vibration is annoying with 7200 RPM drives. Somewhat under powered CPU. Not confident about IO connector. Doesn't ship with ssh enabled, requires some "fiddling" to enable SSH and change the root password.
Summary: This was the easiest NAS that I have setup. The web interface is very basic and easy to use. Drive installation is simple - place the drives in the trays and fasten with four screws. I installed 2x 3Tb WD Red drives in Raid 1. As soon as I had the NAS powered up, I set it up to transfer 980Gig of files from the drive on my htpc. Speeds were slower than advertised - about 35MB/s but this is more than adequate for media streaming and backups.
Pros: Looks great and good quality construction., Very easy to setup., Uses up to 4Tb drives., Hot swappable drive bays (Raid 1 only), Great deal when on sale.
Cons: Slow transfer speeds., Interface provides limited functionality