Having played it at Bricket wood today, it's an excellent format. The limited paint stopped you from shooting too much after the initial lanes, and you had to pick your shots a little more. This made secondary moves a little easier, and made the points a little frenetic as the positions on each side were a little more fluid. The points seemed to be as long as normal, but a little more action filled (not dramatically, but noticeably).
The biggest difference I noticed though, was the transitions. Having only the need to refill a max of 2 pods and a hopper, meant that having a stack of pods ready was simple and you only needed to stuff in a pair of pods and top the hopper to be ready to go on - you could play the whole game on one air fill as well. It strikes me that this is a huge benefit to the lower divisions, and means they can play race points with a minimal or even non existent pit crew, and a predictable maximum paint bill. It also stops teams losing through not being able to afford the paint. I didn't play Campaign last year as the answer to "how much will it cost?" was often "depends how much paint you use". This makes it budgetable and predictable.
The biggest difference I noticed though, was the transitions. Having only the need to refill a max of 2 pods and a hopper, meant that having a stack of pods ready was simple and you only needed to stuff in a pair of pods and top the hopper to be ready to go on - you could play the whole game on one air fill as well. It strikes me that this is a huge benefit to the lower divisions, and means they can play race points with a minimal or even non existent pit crew, and a predictable maximum paint bill. It also stops teams losing through not being able to afford the paint. I didn't play Campaign last year as the answer to "how much will it cost?" was often "depends how much paint you use". This makes it budgetable and predictable.