I don't have a Space Case, but the NewVape Fine grinder is one of the highest quality 2-piece grinders I've used.
Honestly, I do not prefer two-piece grinders, so I rarely use mine...but out of all the grinders I have, my NV Fine Grinder is probably the one I'd put in my Zombie Apocalypse survival kit, as it seems bomb-proof...and it's heavy enough to use as a weapon.