I own the titanium version (bought outside of Drop), it's definitely worth it. I strongly suggest the Ohto Ceramic 0.7mm refills, the best ones I've tried, very smooth and regular writing, and very pigmentized ink (unlike some where you feel like you're writing with water paint), they're hard to find though (at least in France).
Btw, pics for bronze and copper versions are wrong, they show the side click pen, not the bolt action one.
tanbwSorry I don't know, I only own the regular size one. But if G2 refills fit in the short one (I don't know if they do), the Ohto ones should fit as well.