Salutations Tony6Strings,
The Glass VaporGenie never tempted me because it would have proven just too fragile, hence my preference for the Classic-look Aluminium and/or Bronze Sherlock instead: quite obviously those are much more forgiving in case of a mishap...
Initially yellow flames were a problem too, because that's a sign of
incomplete combustion, so i switched to blue torch flames as soon as i managed with VG's wood tops. At 1st by reconfiguring the core, then by replacing wood with metal.
Combining Dual/Converging Torch flames with Hybrid Cores installed inside All-Metal tops provides access to a time-compressed experience that no longer conforms to VG's original method and ritual.
Although
my customized VG pipes remain compatible with the yellow flame of ordinary butane lighters there's no going back, nor would i have the lungs & skills for a slow/steady scenario, though i must admit the GVG offers eye-contact on a flame's tip which i found necessary as well, so it's why i had to create flexible PVC Tubing Extensions...
My Pre-Heating phase only involves minimal inhalation force barely sufficient to avoid self-extinction from accumulating exhaust gases in the Flame-Catching Funnel, while injection of Fresh-Air right above my bowl protects its noble load until the SiC Front Puck turns Dim-Red.
Once the flame has been removed i can use temporarily-stored energy to perform an actual inhalation phase, still with the benefit of portable self-moisturization. Compared to VG's original design this allows me to operate a device i never managed to control otherwise, briefly put the task gets greatly simplified once its applications range is expanded and made less critical.
This configuration works best when a heat "burst" is powerful enough and yet brief enough to maximize the approximation of a thermal valve alternating between 2 states: idle vs airflow. On another hand it don't know if it works as well with substances other than dry cannabis, YMMV...
My Vector KGM Arsenal still works correctly after a couple years, idem for the Volt, quite possibly a consequence of relying on 2 ~ 3 seconds flames at most. The Apollo model added flame convergence which feels quite suitable for my prupose but i got the impression it won't be as reliable, which is probably one good reason why i can't find it on the manufacturer's web site anymore (discontinued??). So, when an opportunity shows up i'll want to try their IronFist instead (with 3 converging flames!); at that point it's safe to assume i won't need to evaluate tabletops.
Of course such products are significantly more expensive than jetables, most unfortunately, but fun/pleasant to own & use if lucky and careful not to clog them with poorly filtered fuel - which ain't appropriate for an inhalation path in any case.
Good day, have fun!!