Dry ice hash is way faster than making bubble hash too.
I made dry ice hash once, the last time I made hash, and I'll probably be doing it that way from now on. Within 10-15 seconds of shaking, all the best blonde kief was already extracted. I collected that and shook for another 20 seconds, and collected that (2nd sieve), also very good, but not as good as the 1st sieve. Then I shook it for another 30 seconds (3rd sieve) and what came out was already green. I could tell that further shaking would no longer produce quality kief.
Fast and excellent. The smell when shaking the kief out is overwhelming, like breaking up lots of the best smelling bud.