Last year, Viridian and Ruger teamed up on a green laser for the SR9. It was at 50% regular cost, and they through in a Blackhawk! holster for the gun/laser combo as well. I couldn't resist the price. For what a Springfield XDm was going for I got the SR9, laser, and holster. Good deal.
I'm VERY happy with the weapon, but that isn't the topic of the post.
This gun/laser combo is now my nightstand gun. The green laser is extremely visible, even in broad daylight. it was easy to sight, and has four different modes of always on or a flash pattern. This adds greatly to the battery life, and gives some tactical advantages when working as part of a team. Not important to a homeowner probably.
The Viridian's biggest weakness is the terrible placement of the on/off switch. It is a pressure pad on either side of the laser unit. You know, right where pressure is applied by say, a holster. Idiotic. I don't carry mine since a coworker asked me about the green dot on the floor following me around.
However, for nightstand use it is ideal.
While my particular unit is specific to the SR9, Viridian makes dedicated units for S&W's and generic units as well. Just be aware of the incredibly stupid button position.
The Highlander