It's great. Plays everything although it seems to have issues with DTS (at least in the MKVs I've thrown at it). It has a major 3rd party firmware scene which highly extends the base software. I "own" 3 of them although 2 of them are at my parents' houses. Easy to use interface, streams netflix and youtube, plays everything, supports 1080p. Hard to beat for $100.

I hate the Seagate one though, I bought 2 of them and they were both garbage, both flickered at 1080p for whatever reason. Also the interface wasn't nearly as nice as the WDTV.