This is a very fast little box. Apparently it's identical to the Netgear ReadyNAS Ultra 2 Plus but it comes with a 5-year warranty and access to the Netgear business support site rather than the consumer support site.
Pros: very fast dual-core Intel Atom processor at 1.8 GHz, 1 GB DDR3 RAM (note: product documentation says DDR2, mine is DDR3)
Setup was a breeze
Very silent. My old Netgear ReadyNAS Duo sounded like a jet engine.
Cons: Netgear does not officially support upgrading the memory in these units. They claim that's because memory manufacturers will change products but keep the same product number, so one 2 GB chip of Acme "ABC123" memory might work but another wouldn't. I think Netgear should leverage their buying power with the memory manufacturers and sell a Netgear-branded memory chip for these things, or at least offer a 1 GB option along with a 2 GB option for e.g. $40 more. This all said, mine flies with the regular 1 GB so I have no need to upgrade, other than this strange compulsion to max out the memory on every computer or computer-like product I own.
I bought this unit to serve as a dedicated jukebox server for my 5 Logitech Squeezebox network music players. Squeezebox Server is a very resource-intensive application that I formerly had to run on a dual-core 4 GB Windows XP desktop because no NAS drives had the horsepower to run it gracefully. On this ReadyNAS it flies. Not a cheap box by any means but it is easily 3 times as fast as my D-Link NAS units I use for bulk file storage.
I put a single Seagate Constellation ES 1 TB 7200RPM 6 Gb/s SATA 64MB Cache 3.5 Inch Internal Bare Drive ST1000NM0011 drive in it, as I am only using 400 GB of storage.
Final note: all of the NAS manufacturers are obsessed with RAID. Make sure you buy RAID-compatible drives for this unit. That means either enterprise-class or Western Digital's new red series. Netgear maintains an up-to-date listing of approved hard drives at [...] Do not buy cheap consumer-grade desktop drives for this device.