I have a Nighthawk, albeit about 2 years old. I live in two-story town-home with garage and I have no problems with reception. In fact, I am usually connecting to wifi on my phone about 30 yards before I pull into my garage. I mostly watch tv downstairs via streaming with no problems.
Cox is my ISP and my I have pretty good download speeds. But, I did go into their store a few weeks back because I wanted faster upload speeds and the CSR was pretty tech savvy and he said that I should probably upgrade my modem in December/January as there is a new modem standard getting deployed as well later this year.