Many sidemount BCDs place the dump valve on one side or the other. Releasing gas from these systems requires a roll onto your side, which may be OK in 2 cylinder configuration, but when carrying multiple cylinders, changes of trim and balance require considerable effort that really should not be needed.
By placing the dump valve in the centre of the STEALTH 2.0 TEC wing, you can release excess gas with either hand and stay in perfect trim while you do so.