SP impulse with 32* drop forward and a Pure Energy 20 oz with anti siphon and this on/off
Strengths:
saves your o-rings, conserves gas, looks good, pretty cheap, easy to turn, does what its supposed to
Weaknesses:
if you for some reason turn it on while not attached to the gun, it will shoot CO2 everywhere. but i really dont know why anyone in their right mind would do that...
Conclusion:
i got mine for $20, something really simple that helps you out alot. pays for itself in o-rings very quickly. tanks without on/offs, when you take them off sometimes the o-ring is all white and stretched out. when you take the tank off with this, the o-rings look perfectly new.