Pros:
1. 1 TB hard disk bundled, enough for most non-tech savvy users' contents
2. HDMI 1.4 support plays most existing 3D content on 3D TVs
3. Expanded online services compared to previous generation product
4. Improved user interface compared to previous products in this lineup
5. Supports sync of USB drives and digital camera contents to internal hard disk through USB
6. Easy control of playback and interaction with the streamer through Web Remote and USB keyboards
7. TrueHD bitstreaming and WMA(Pro) decode work fully
Cons:
1. Many bugs existing in previous generation products still left unfixed
2. GbE port seems more like a marketing gimmick, rather than actually adding to the performance
3. Content can be transferred to the internal hard disk from a computer using the network only
4. Can't stream multiple HD streams from the Live Hub, though the specifications seem to indicate that it is possible
5. For a flagship product, WD should have tried to provide full HD audio bitstreaming / Blu-Ray ISO support / advanced media streamer features