What's the best NAS for home usage with Macs?

Please share your experiences and reviews about NAS ([Network-Attached Storage](http://en.wikipedia.org/wiki/Network-attached_storage)) below. In particular, rate their compatibility with Macs, OS X, iTunes, Time Machine, AppleTV, and other Apple-specific tools. The goal is for future users to be able to easily find the best Mac-compatible NAS appliance. Rules: - Use a single answer for each NAS (no duplicates, please). - Vote (up or down) on any NAS you have experience with. Also welcome: useful reference links, such as [this one from xlr8yourmac.com](http://www.xlr8yourmac.com/feedback/mac_NAS_and_wireless.html) .