Cool. It is one of those things that looks so obvious once you see it. If I need to buy a throw bag I'm getting that one fer sure. Stuffing a long rope into a 4" diameter hole is no fun at all and I'm surprised it took this long for someone to just make the hole bigger.
The big appeal, as they say, is that it is a pain to restuff a bag after the action is over with and this bag solves that problem.
I wouldn't plan on restuffing a throw bag for a 2nd throw, however. This was kind of alluded to in the video. I don't think that's gonna happen. If you don't have 2 throw bags on you then I think you need to fold (not coil) your rope as you retrieve it and then toss it again without restuffing it. Mike Mathers teaches the technique and I assume other swiftwater instructors do too.
In any case, I always have 2 throw bags when I'm standing in a spot for safety. I leave the smaller one on my body (chest pocket) and hold the big daddy for the first throw. If I miss then I can dump the first rope in a heap and chase with the one in my pocket. That is plan A and plan B. I am not going to be the guy standing there with my dick in my hand if I miss the first throw