Summary: I use a pair of WD 3T Green drives - everything works at advertised. Throughput is acceptable across the wire - slower than my old G3 Compaq/HP server but MORE than adequate for home/SOHO use (about 1/2 a gig was my best case on large files with large frames). Hot swap is nice - the drive trays feel cheap/"plasticky", rest of the unit is fine.
Pros: Simple setup, quiet, lots of software included - more downloadable via the web
Summary: This NAS Is both fast and has many great features. Setup is a breeze, for someone who has never used a NAS before. Experience users will love the options that are available. I put in 2 3Tb Seagate Baracudas, they where recognised straight away, formatted and ready to use in under 10 minutes. It has a lot of security options from Active Directory integration to Groups and individual users. It handled quotas and everything you would need from a NAS.
Summary: This is a really good product. Fairly easy to install ans set up. Menu's are clear and easy to follow. There are a lot of included apps but most are not very useful. It works very well as a DNLA box streaming FLAC music and my videos across my home gigabit network. The included TWONKY media server could do with some work but it does the job I suppose. All in all a great device.