You see, I'm coveting the Pax 2. To me, it seems like the Apple of vaporizers--elegant, sleek, and minimal fuss so the device disappears. Plus, the company is clearly here to stay (I don't want to be a pioneer with a new company/product).
There are stealth- and group-related situations for which the Pax is perfect, and times when you want the flavor only the FF will deliver. Or you want just one or two hits, and on-demand vapes like the FF are perfect for that application.
A HUGE consideration for me is the smell that a vape produces during a session. I haven't tried a Pax 2 yet, however when comparing the Firefly to the original Pax (or any other vape that I've used for that matter) I will say that none of them come close to the Firefly in the odor stealth department. The original Pax can easily fill a room with odor before the first draw. The Firefly, on the other hand, produces virtually no odor as long as you don't open the lid. Pax (original), Pinnacle Pro, and Inhalater XP all produce significant odor during use, due to the constant heating of the material. Even the Solo produces more odor than the FF, although I would have to rank the Solo 2nd in the "odor stealth" department.
For this reason I would not add another portable vape to my lineup unless it could match the FF in odor stealth. I'm assuming that the FF2 will perform equally as well in that department.