I put one of these in my sister's toy room for the kids:
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www.bestbuy.com/site/wd- ··· p=1&lp=1It looks like the same thing, though that ebay listing shows several different model numbers.
Hard wired, it plays every file mkv, avi, and mpg I tried. But the wireless signal is too weak for 720p or 1080p. It constantly has to stop playback and buffer. The unit is sitting 1 floor up, and about 15' over from their Netgear N router. Obviously wireless signal strength is going to be different in each home.
I am not a fan of the interface, and the kids (5 and 7) have a hard time getting to the media they want.
I recently installed an Amazon Fire TV box on the same TV, loaded with XBMC, and it is able to play up to 1080p over wireless just fine. It takes about 25 seconds to start playing, compared to about 5 seconds on ethernet, but once it is going it doesn't stop to buffer.
The files are hosted on a hardwired HTPC. I'm not sure there would be enough bandwidth/signal to go wireless to wireless, but I haven't confirmed that.
I haven't tried a Roku.