Boxers...I've seen these in stores, and they look horrible...Horrible idea.
Brilliant idea. Kids that are actually self conscious about bedwetting would definitely prefer something like this over the "underpants style" IMO. Also, they are another revenue stream for KC allowing them to give less product for more money, as I believe that they are more expensive or the same amount as a similar pack of regular goodnites, only you get less of them in a package.
They also are pretty absorbent and do swell quite a bit when you put them on.