Paging Cyanide.... [emoji3](Sorry, OP...just having some fun with Mr. DAO on this forum. The serious responses will come along shortly).
You rang, brother?! [emoji23]
Like the others have said, it is a consistent trigger pull, with the heavier pull weight adding a (possible) slim extra margin of safety. I will add, contrary to popular belief and opinion that a shooter must have a short, light trigger pull in order to place accurate, effective fire on target, with proper training and lots of practice, a good DAO is no harder to master than anything else.
For those who are experienced shooting DA revolvers, they are second nature and, at least for myself, a fun way to challenge friends at the range for a little good-natured competition. This might come across wrong, but there's usually no faster way of "waking someone up" than to have them shoot various distances with DAO, especially whenthey perform admirably with a tuned SA or striker trigger, but forsake DA because "they'll never have to use it".
I personally like it because it forces me to focus even more on the task at hand and, it is simply the pistol trigger system I have the most experience with in the last (almost) 28 years of shooting. Concerning handguns, after I become acquainted with one it doesn't take long for me to get my double action grouping almost as tight as single action/striker fire within reasonable distance (15 yards for example). Mind you, it doesn't mean I'm shooting super tight groups at 20-25 yards, but it's a nice challenge! I simply prefer light triggers on a competition firearm, not something I'm going to carry.
Below is a picture showing my four beloved DAO's, with trigger pulls ranging from 6 1/2# up to 9#, three of which alternate in my carry rotation (the P-09 MHS is just a tad too large for my short, stubby self LOL). The only non-DAO pistol I carry is my Glock 19, but even on it I modified the trigger to best emulate a decent DA pull with the NY1 Spring and Minus Connector combo. Takes out almost all of the pre-travel mush and makes for a very nice six pound or so pull. I'm one of the rare oddballs who also has no problem with the NY1 spring/stock connector combo, giving a nice 8# pull.

Now, with all of that said, I'm NOT a fan of HK's LEM or Sig's DAK (though I like DAK much better). I get the concept behind both of them, but they just don't do anything for me. And believe me I've tried, and multiple times!