If you haven't bought yet, Ars posted a lengthy review of a Synology unit the reviewer used for months.

http://arstechnica.com/gadgets/2012/09/synology-ds-412-is-fast-fun-and-flexible/

The home NAS market overall is in a great place these days. I've made use of my ReadyNAS a few times during this trip, including setting up a source control server on it yesterday. All the flexibility of Linux under the hood with most of them, but without the need to set it up from scratch if that aspect doesn't appeal to you.