Looks pretty good for backyard plinking.
Loose rounds are a problem in an "emergency" situation. I would much rather be stuffing stripper clips into a magazine than load two at a time... Don't get me wrong, innovation is way cool but that shat won't cut it if you need ammo in a hurry.
I could load 4 or 5 30rnd mags with a stripper clip in the time it takes to load one of those in the vid. Zip, done, next!