I don't have a lot of trigger time behind handgun optics but my experiences to date have me convinced that RDS are the future, on all firearms. It's so much easier to get hits, especially at speed, that it's almost cheating. It would truly to suck to ever have to use my sidearm in a defensive situation and find myself & an iron-sighted sidearm facing an attacker that had a RDS on his or her sidearm! eek
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman