This stuff is so cool. The blue is somewhat transparent, so you can see a couple layers in for sparkles, but not enough to see infill (at 0.6 deep). The sparkles are multiple colors, and shine bright! i used an 0.3 nozzle, and was worried about clogs....not one problem!
Definitely worth the price if you want something a little more special than just plain blue. Prints great on a Prusa MK3
Proto-Pasta filament in general has performed the best of any filament brand I've tried, and this filament is no exception to that. Along with its high quality, Wonder Blue brings fun to the table with its multi-colored glitter pop and its deep blue tones that are fun to stare at. I definitely recommend :)