Have a few HKs with the LEM trigger...love them, and really not that different than regular DA/SA. Once you start shooting them, you quickly realise that it is in fact almost the same, except for the trigger take up after the first shot fired in DA. But when you are shooting, you will never have to worry about the light trigger take up before hammer break unless you are completely removing your finger from the trigger. Once you've fired the first round, all you need to do is allow the trigger to reset for the follow up shot. And that is exactly the same as any other DA/SA pistol...release pressure from your trigger finger, trigger moves forward, clicks, and is ready to go. That's it.
You really need to try it before you condemn it. The SRT trigger is amazing, yes, but in my opinion, so is the HK LEM. I have both, and love them both. Don't get intimidated by what others say about the LEM trigger, and how tough it is to shoot, and how you have to go through so much ammo to learn...it is the same as shooting any other pistol...get a good sight picture, control your breathing, steady your aim, and squeeze the trigger with good control...the gun will do exactly what you want it to do.