I've stayed away from these due to the price and the horror stories. It seemed like every other week on other forums some newb was having cycling issues which were quickly remedied by removing this $125 part and replacing it with the standard $3 spring and $15 buffer.
If you don't like the sprooooong sound, then sell your AR and buy something else.
Ok, maybe that was a little extreme. JP makes good shit - no doubt. The problem is that there are other folks out there assembling AR uppers that are right at the very edge of the tolerances (gas block not perfectly aligned, bolt dragging a bit, etc.). You throw a high-end, very specific part like this on one of those builds and you'll get issues.
Embrace the sprooooong!