Ok, it is not a paint roller. That is just what I thought when I first saw this. Personally, I find the concept interesting, and I can think of some unique uses, including as a remote control paint roller.
But, seriously, I wonder how much flight times might be improved if a "mission" was mostly rolled around on the ground, with only short hops over obstacles? I may have to contact my friend at BG and see if they could send me an evaluation model for some testing.
Check out the specs further here.