I got the vapor nozzle a couple weeks ago, it ended up cracking and the hole sort of melted/fused shut a bit for some odd reason, but it still works, oddly enough...
Considering the quality of Grav glass, I'm rather shocked it cracked so easily, and that the hole fused shut.
If it works, it works, but it would work twice as good if it were wide open like the very first hit. ;)
That's why it gets 3 stars.