Realistically speaking, there's two versions of the LEM, the regular one (V2) that has a constant pull of some 7 lbs, and then the light LEM (V1, 4.5lbs), which everyone likes but HK doesn't seem to want to actually sell. There's supposed to be more variants of the LEM, but I don't think they've ever been offered for sale here, unless it was to a LEA. I've never once seen a Light LEM (V1) pistol in the wild, except for those whose owners have converted them.
Never met a V2 LEM owner that liked the trigger. It's just too heavy and long each and every time. You can get accustomed to it and learn to work the reset, but to me that's counterproductive to training skill sets with other, normal pistols. I know a handful of people who have bought them and tried to like them, but they all got sold off at a later date.
When HK makes a new generation pistol with a constant pull, minimal take-up, 4-5lb pull range and a short reset I'll be very, very interested. It is for that very reason that I've been shooting mostly Glocks lately. Until then, I'll continued to use the USP in Condition 1 or use the P7.