I had a look at these units at Buzz Fest. It was interesting.
-Eliminates the safety concerns that are possible with pan style. Pan style can theoretically start a fire if bur comb is in contact with pan. For all the people using pan style vaporizers on Bee-L or beesource, I've only heard of maybe 2 or 3 that have had any safety issues (and I know 1 of these was home built).
-May better distribute the vapor and be less harmful to the bees since it's blown up into the hive instead of diffusion (and bee fanning). Not confirmed but plausible.
-No hot pan that kills nearby bees during treatment.
Disadvantages or no difference vs pan style:
-It actually takes longer to treat vs pan style. Pan style is 2 minutes per hive (I pull and cool pan outside the hive).
-You still have to fill the unit with OA after each hive.
-It draws more current from a battery vs pan type.
-4-6x the cost of pan style. If my memory serves me, it was closer to $400-500/unit (don't quote me on this). There is absolutely no way I would pay $3k for it as there are much better commercial scale options for ~$3k (i.e. VmVaporizer for $3.5k).