It works as advertised. I had been having leak related issues w/ my B2K. My stock LPR was occasionally giving my gun waay too much pressure, and it was leaking all the time. I would charge the gun, it would leak. Fire a few shots, the leak would stop. Fire a few more, the leak would start. It was very annoying, especially to me. I hate even the littlest problem w/ my paintball guns. This fixed the leak problem, and keeps the internal pressure very, very steady. As a result of that, velocity is much more consistent.
It is so much easier to adjust this LPR than the stock LPR. Quick little twitch of an allen wrench, and you've got the velocity dialed in. The lower profile of this LPR is nice too, it makes the gun look a little cleaner.
The gauge...what a godsend. I hated the old methods of adjusting my LP - "dial up the LP until the gun leaks, then dial it back until it stops, give it another half turn, blah, blah". I've almost sacrificed chickens try to get it to work! This gauge took all of the guessing out of the situation. Screwed the gauge in, and you know EXACTLY what the pressure is...very handy.
Also, the whole setup was a cinch to install - took me about a minute, and that was only because it was so hard to get my old LPR off of the gun.
The price. It is a little pricey, but if you are having leaking issues with your gun (assuming they are LPR related) this WILL stop them. The usefullness and quality of this product offsets the price issue in my opinion.
It's worth the price, even though it is expensive, and I would recommend this to anyone that was having issues with their gun, or wanted to stabilize the velocity of their gun a little bit more. I'm very impressed!