The Sig DAK is a lot like the Para Ordnance LDA trigger, a light DA trigger that has a full reset (i.e., the trigger has to return all the way to the front before you can fire again). Personally, because of the trigger reset, I prefer their traditional DA/SA trigger. I also prefer the HK LEM trigger, which is DAO, but has a much shorter reset.
However, the DAK does feel somewhat like a very nice DA revolver trigger, so if you like that, I bet you'll like the DAK.
Cheers,
Liam