Richard, I agree that it looks a bit fiddly, and they misspelled time "lapse" twice in the video. Sorry, had to complain. :P However, I think if you were well practiced, it wouldn't seem that bad.
While this would for sure be a luxury item for UL'ers, it doesn't seem like the weight penalty would be too high. Besides the concentrate and powder mix, you have the bottle, which could easily substitute for your regular water bottle. I'm interested to hear how the beer reviews end up.
My apologies to John for the thread drift. (but I guess It's still "Beer Gear!")