While technically LEM isn't DAO (HK's true DAO featured a heavy triggerpull, and consequently is pretty rarely seen), it operational use I'd argue that it is from a practical/user standpoint, with caveats. While a long (and fairly light) initial triggerpull is required, there's also a fairly short reset, so your follow up shots can feature a much abbreviated triggerpull distance. I guess in retrospect, it's an interesting amalgamation of DAO and DA/SA, or a light DAO, depending on training and action preferences. 1st shot DAO, 2nd shot if utilizing the reset, result is close to SA; if 1st shot DAO, if trigger is then run out fully forward, 2nd shot is more DAO-ish.
Triggerpulls can be excellent; anecdotally I think HK's LEM has a better rep triggerpull-wise (especially regarding smoothness) than comparable HK DA/SA triggerpulls on the same platforms.
I certainly like mine, but I had HK modify mine to provide more trigerpull resistance weight, midway between V1 and V2. That to me makes my triggerpull much more like other "true" DAO pistols/revolvers.
Best, Jon