1. The equipment comes with a free scuba tank refill adapter which means you can refill directly from a scuba tank in seconds, this refill adapter can be fitted to a mechanical compressor as well. 2. It only takes about 30 seconds to refill from a scuba tank using the scuba tank refill adapter.
3. At 3,000psi the equipment holds about 60 breaths at 1atm. It takes around ten pumps per breath to fill the equipment (600 pumps). It gets harder to pump as the pressure in the tank increases but it is manageable for an adult.
4. Bouyancy issues are much diminished for the reasons above but that is also partly because equipment lends itself more to shallower, active dives, rather than the long slow drifts at depth of scuba.
5. Each equipment has its own pressure gauge fitted which tells you how much air is left in the equipment at any time.