I've gone from some cheap grinders to a two-piece Cosmic which I had used for several years. Recently I wanted to try a four-piece and I got pushed on a Sharpstone with a crank which I managed to break within a few months of heavy use where the crank lever just tugged right off. However, I did find that I preferred four piece simply for the cleaner workflow as originally I was using a funnel stuck into small jars while emptying my two piece.
Anyway, long story short I just bought a medium four-piece titanium Space Case today. The grind action on it is easily the best I've used, however the top grind piece fits a /smidge/ loose which combined with the very solid black color made me a bit concerned I might have purchased a knock-off. My Cosmic fits perfectly together and it's obvious the pieces were machined to be mated together. Mind you, so far I like this new grinder the best out of all of the ones I've owned but I'm needlessly concerned none the less that I might have been ripped.
Any expects willing to chime in if they think what I have is legit?
To get into details of what it is I own, sans photo: The coloring is pretty solid black which I wasn't expecting and it's stamped 'Space Case (r)' and 'Made in USA' on the top grinding piece. There's nothing else etched on it, however the top and bottom pieces both have a ridged grip made up of rows of dot-like pits. The top has two additional thin bands running along the circumference just beneath the grip. There's a light gray teflon gasket that runs along the lip of the second piece in the stack, which the grinder piece sits atop of.
EDIT: Thanks biojuggernaut! That's a relief, even though I already love this grinder either way.