I'm a daily user of the Solo 2, I have used the standard glass WPA for many years now. Ed's handiwork here though, it is a full upgrade to that in multiple ways.
The increased airflow is a tad bit subtle for me, but dropping the "four holes in glass" screen instead for the stainless screen, it seriously boosts vaporizing efficiency and I'm absolutely thrilled with how gigantic the chamber is. You can go through a ton of product quickly with something like this. Call me a satisfied customer! I appreciate it Ed.