Check out this deal. For a limited time, the WD TV Live is available on eBay.com for $64.00 with free shipping. The only catch is that the device is refurbished. Also, the listing is posted as a WD TV Live Plus, bit it appears to just be the WD TV Live.
Jump on this deal while supplies last. Great for anyone just getting started with cord-cutting. Link
my roku boxes work great
No need for a WD TV Live when you got a Roku!
Can another alternative OS be installed on the WD TV? How useful is the built in OS?
Custom firmware can be installed which unlocks a ton of functionality. Check this guide. It appears that this greatly increased the attractiveness of the device.