The issue is the "air path", it is truly GonG but that doesnt mean anything other than 2 pieces of glass sliding into each other.
The Ascent is as much an "all glass air path" as the solo is. I mean the air is coming from the bottom thru a grill which isnt glass, and now I realize it mingles inside the upper path (plastic, silicone etc) too, as if you notice the 2 straws (glass screen and mouth piece) have no proper GonG connection, and are therefore sucking up inside air.
Where does this air come from inside? I can confirm the top silicone seal if you pull the tool out raises up a bit, as if its not attached in anyway there is definitely an air gap there very similar to the solo. However PV sent me some silicone O rings for the solo that solve that air gap.
I agree with your statement - however as far as I know the Solo marketing campaign wasn't trumpeting itself as the world's first true GonG portable