1. To know it is to love it.
2. With a steady hand and confidence, you can install the online available kit yourself.
3. More cost effective and quicker than custom trigger work by HK experienced gunsmiths.
4. As a complete package may add perceived value to your firearm.
Make sure one understands the full operation of the LEM before diving into it. The advantages of the LEM is consistent pull pull from the first shot to the last, then the bobbed hammer, and long trigger slack take up for CCW/duty use. Disadvantages to some is the very long trigger slack take up compared to the SA mode of a traditional DA/SA version. Trigger pull and reset are virtually the same between the 2 versions, if similarly set up. Both LEM and DA/SA versions take spring, aftermarket items and trigger work upgrades with similar nice results. This goes for any HK45, USP, P30, and P2000. VP9/40, other models have other solutions.
I have exclusively used H&K handguns with the LEM variant triggers for 10 years and 10's of thousands of rounds put dowrange so I have quite a thorough understanding of how they work, I have found that there is not much overtravel in the LEM variants maybe 1/16 - 1/8", and the overtravel screw has too much chance it of preventing sear drop and causing a malf for me so that juice is not worth the squeeze, that alone cannot be what makes it so highly touted. Still have not heard that lightbulb fact that says ohh yeah that is what makes it so special. No match hammer, the match hammer spring is not recommended (which has entirely no effect anyway on a pre-cocked hammer ala LEM), no match LEM sear, match trs not recommended.....?? And when HK itself installs a Match/LEM set-up they do not use any special sauce or aftermarket parts.