Technically this product does do what it says, it reduces your trigger pull. Unfortunately this product isn't plug-and-play though. You can't just put 2 pins in and start using it. You have to test it hundreds of times just to get the correct configuration. Then when you got it right, you have to test it out on the field.
--- More detailed explanation ---
The product works by replacing 2 pins inside your trigger assembly. You have a choice of 5 different pins with varying (all larger than standard) sizes. The larger the size, the shorter your pull (simplified). The size you need varies from marker to marker. Even if your friend is using the exact same model marker, his might need a different pin size than yours.
So your sitting at home, testing out each pin configuration. When suddenly you found it, the perfect pin size. You pack up your stuff and wait for the day you get to use it. You get to the field and start playing. You bump into something, then try to fire! Your marker just goes full-auto because your trigger won't reset. Yep, something you didn't account for. Something not even stated in the instructions. If you were too aggressive with it, a slight bump in the marker kicks you out of the game.
After trying to work this thing, I've decided not to use it at all. The benefits are too small for its weaknesses. I can't afford to be kicked out of a game because of it. That and Tippmann markers are known for its durability. Yet, this product actually reduces to the lifespan of the trigger assembly. The larger pins causes more rubbing to occur which increases wear and tear.