I just installed the GG comp kit and it is great. I have an X5 and it still lightened the pull about 2lb if I had to guess. I didn't measure beforehand but take up is a little bit shorter, reset is definitly shorter and there is zero over travel now. While I had it apart I polised the trigger bar and the wall of the FCU it runs on.
I did run into a gritty feal after installation. After pulling the trigger and putting the FCU to my ear to hear what part the grit was coming from I realized it was the new sear. I didn't lube it afte the install. One drop of Lucas Oil and it is all gone. I did add a small drop to all connecting points while I was at it since I gave it a good clean when I took it apart and all the grit is gone. Might want to give the sear a drop of oil from underneath a try.