Airlogic just got an invite from me to jump-in here and tell us more about the pedal. Let's hope they show-up and represent.
You'll notice on their site they make mention of only the 'return' force being activated/powered by the compressed air.
-Your Airlogic bass drum pedal does not make use of springs, either expansion, or compression to provide the return force.
-Airlogic is the only pedal that utilizes compressed air to provide the return action.
-The air cylinder on the Airlogic pedal makes use of compressed air which roduces a pneumatic force to return the beater.
Interesting would be how much resistance is at the start of the stroke. Zero, a little? We're assuming beginning stroke is related to how much pressure is in the tank, even though the foot pedal is not used to charge/pump-up the tank.
-This graph illustrates the fact that less force is required at the beginning of the stroke and ramps-up exponentially as the beater approaches the bass drum.
Airlogic makes mention (a few times) of the pump possibly failing to pressurize fully.
-Periodically, or when the relief valve is not sealing completely, add 1 to 2 drops of "3 in 1" type oil to the pressure relief ball. Allow the oil to work into the valve to improve seating capability.
With one of these pedals you'd worried about blowing a seal. Not really a new twist though. Drummers can blow a seal on their air-lift thrones, but they can still make it through a gig. Another seal to worry about?