well its good for a number of reasons if you have bought a regulator such as a vigilante or pure energy reg the first thing you notice it doesnt have a gauge to tell you the psi going into the gun not only that but its smaller in size so it doesnt get caught up on things like most gauges
Weaknesses:
nothing so far
Conclusion:
So in conclusion its pretty much worth the effort and cost of installing on your regulator / tank i would hihgly recommend getting one