I've had the Hopper Duo for a few months after my 722K bit the dust, and haven't really delved into all that much. The strangest thing is how the DVR can be 40% full, then all of a sudden be at 80% the next day, even with only one or two new recordings. Also, is the Bluetooth adaptor Dish has for $15.99 the only one that would work with my receiver? Can I hook up an external hard drive to the Duo? I had to go as cheap as possible when replacing the 722, so this is what I'm stuck with for the time being. Really miss my 722K.