For $22, you can keep the marbles...
I'm going to assume that the other reviewer typed "marvel" when he meant to type "marble." If his marble broke, that's probably on him for throwing it in iso too quick. If not his fault, who cares? I've broken so many marbles, I've lost count (mostly valve marbles and pearls; I've only cracked one top marble from temp stress before). Either way, as a serious dabber you better stock up on pearls, pills and marbles of various sizes because borosilicate doesn't last forever. For $22, this slurper is a steal. Bear Quartz is pretty thick and very good quality from my experience. I've never broken any of their bangers before (knock on wood).