Pros: Easy to physically install the hard drives. Great software. Had it up and running in less than 30 minutes. The set-up could be a lesson for other manufacturers on how it should be done. Has a power saving sleep mode which actually works. Cost a little more than some comparable items, but well worth the difference.
Summary: When I decided to set up a NAS I looked into the various options- FreeNAS and other small home/office NAS systems. The Synology software is very user friendly and fairly intuitive. You can simply install whichever modules you need, and configure them through a web based GUI. I have moved over all my DVD collection to the NAS, so I don't need to worry if/when my main office computer gets funky but I want to watch something streamed to my TV.
Summary: My wife bought me this a gift out of nowhere. I suspect that she bought it to me because she was sick of hearing me wanting a NAS though. :) Anyway, it is a very good NAS. I work in IT infrastructure, so I've played with many NAS/SAN solutions. Although it is a "cheap" enclosure, it doesn't feel very cheap and does have a lot of power to deliver. Usually, Synology NAS are made of metal, but this one is made of plastic to save costs.
Pros: Powerful, yet cheap, 512MB RAM, Synology DSM (very good OS), Stability and AIO solution
Cons: Drives are not hot-swappables, Enclosure made of plastic
Pros: Setup wizard makes it a breeze setting it up. The lights are under control as compared to earlier models, making it easier on the eyes. Bolt-in process makes it easy to install the hard drives. Much faster than my old 212j Bigger too!
Cons: Larger footprint is of some concern for those tight on space. It's a good 1/2-3/4 inch wider than the 211j so be mindful where you park it. The housing is of a different plastic composition, and it has a different feel to it, like it's almost flimsy.