Yeah, I think they've changed the firebox as they were having to replace under warranty.
So as I see it the differences between 1 and 2 are:
The hinge - this was never an issue for me on the pitboss I had.
The felt - this could be replaced to the upgraded version when it needs replacing
The vent - this is the main issue, but a replacement looks to be £75
Is there anything else im not thinking about for the classic 1?