I have 226R/.40, and I bought my dad a 220R .45 about 2 years ago as a give. Basically the same gun.
I did not get a DAO gun because I don't like the long trigger. Its smooth, and I'm sure some folks like the consistancy more. The standard Sig action is a long pull first shot, leaving the gun cocked and ready to fire every subsequent shot. I don't know the specs off the top of my head, but the trigger pull on these follow up shots is very light, maybe 2-3 pounds. The benefit is that you can thow some serious lead very quickly. The downside is that you are more prone to making a mistake, and one could argue that those follow up shots are going to be less accurate.
As for me, I will stick with the 'throw lead' camp.
I guess it goes with out saying, but these really are fine guns. I probably have a couple thousand rounds through my 226. Very reliable, easy to break down and clean, and damn accurate out of the box.