I love the LEM trigger. I had the original LEM trigger in my P2000SK when I bought it, which was about 6.5 lbs. While it worked well, I wanted a lighter trigger. Eventually HK came out with what they call the light LEM trigger. It dropped the trigger down to about 4 lbs. I shipped it to HK and had it back in less than a week. The difference was phenomenal. Once I bought the HK45CT, I shipped it off the next day to get the light LEM trigger installed. I had it back in 5 days. Some people on the web seem a little nervous about the light LEM. In fact, on HKPro.com, there is currently a discussion going on about a person who has a light LEM and feels it's too light. However, for me, I much prefer the light LEM because I can shoot it fast if need be with much better trigger control.
Oh, and as far as the last poster, HK quality has improved dramatically over what it used to be. There are still a lot of rumors going around on the Internet saying HK CS sucks, but it's not true anymore. Good luck with whatever you get.