I had high hopes for Dynavap VC. I tried a lot with my multiple friends with no luck. VC overheats tobacco so people feel immediate harm - nausea, head / throat / stomache pains. I tried various tobaccos and heating techniques, modded VC, nothing worked.
RE: longevity of Low Temp Cap
I use it for 2.5 years very heavily bc I vape tobacco. After 3000+ sessions it looks and performs perfectly. Once I drowned it, dry it carefully and it worked the same way.
Edit: it was under water just some seconds. Water went inside behind the plate nevertheless.
I vape tobacco at low temp and prefer metal bowls tastewise. Lotus is a king of my collection and I tried it with glass Arizer WPA on glass J-hooks. It was nice but Al stem is better.
From my experience, this is PG who extracts things from the tobacco, while VG makes clouds. VG extracts too but less compared to PG. Pipe tobacco vendors use up to 20% of PG in aromatic blends. VG is used for clouds in shisha “tobaccos”.
Yeah, these are my mouthpieces need cleaning due to narrow air channels (not metal part, BTW). Glass requires less cleaning, hot washing in my case, but I broke one glass washing. Emptying the bowl is easier with metal version - I just knock it on trash can.