I have two Sig DAK's, and two Sig da/sa's. The DAK system is my preferred self defense Sig trigger. The DAK uses leverage to enable the lighter trigger pull, it does not have any hammer precock system. The DAK system has more area in a larger frame so P226,P229 have triggers that have more leverage than a smaller frame such as a P239. The higher trigger pull on the shorter reset point is there in case you short stroke the trigger, it can be used all the time but is not designed to be. The two reset points can be seen if you pull the right grip off and manipulate the trigger. The slide recoiling does not precock the trigger but resets the trigger linkage.
The HK Lem is a pre cocked trigger system, the hammer is a two piece unit, and the inner piece is pre cocked. It is totally different from the DAK system.
The DAK trigger has fallen out of favor lately, and is not a target trigger, but for me it is a great self defense trigger.