First, With the LPC and LPR, you still get the benifit of testing the Low Pressure with a guage like warped said. So that is a plus.
Second, you get much more volume with the LPC.
Third, it sure makes the marker look bad azz!!!
Negative First, you have to modify your ASA. If you dont want to modify your ASA, then buy a MacDev ASA from Airsoldier, which already has the 1/8" NPT thread.