It reduces the pull by about a pound. It's pretty easy to do. Make sure you get the orange backplate (about half the height of the normal one) to make disassembly easier. Takes about 30 minutes or so.
Along with the Ghost Rocket connector, I also have a 6lb trigger spring, which reduces the pull further. Oh, and doing a .25 trigger job helps smooth things out a bit, as well as reducing the sharp angles on the firing pin plunger.