Individual taste, I guess. I played around with a cheap laser to see how they work but do not carry or expect to use one. Some people swear by them.

http://www.luckygunner.com/lounge/laser-sight/

Laser Sights on Concealed Carry Guns | Selecting a Handgun Laser | PDN

Laser Sights on Firearms: Are they For You? - USA Carry

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S&W Rover