My R9 is sightless and I use the slide to aim and consider it a close encounter firearm. Can one really focus on the sights and not the threat under stress? Professionals with continued practice yes, but the common Joe it is questionable.
http://www.pointshooting.com/1nosight.htm.
Which begs the question, why even consider a laser sight on a close encounter gun...half the time you have to search for and focus on the dot especially in bright light, which takes longer even than sighting.
Being I am officially "Out of The Business", I will voice my opinion on small gun laser sights: Asinine and useless item for such a small sidearm.
I have three Crimson Trace laser grips. S&W 66, Taurus 85, and CZ P01. After 10-12 yeas i find they are NOT faster to align. They do have the intimidation factor which is REAL strong if its on someone's chest, within legal bounds of course.