I've got two CS40 DAO pistols; one so nice in the original box that I got another one in slightly lesser condition just to play around with. Even though I prefer the traditional double/single action, I really don't find the DAO objectionable although as it's actually quite smooth. If you've got a killer deal, go for it as I don't think you will be disappointed.
I love mine. Trigger pull was a bit stiff so I cut one coil off the hammer spring. A lot smoother and a lighter trigger pull. It is my primary carry gun.