Great instant on laser! - Viridian R5-Shield Reactor Kit, Green Laser Sight w/CrossBreed MiniTuck Holster for S&W Shield

I found this laser to be great, bright and very easy to see. The down side is if you use this in anything but the holsters that's designed for the instant on capabilities, you have to manually turn on and off which is no probabem except the button is very difficult to press just right if you have big fingers. I found it hard to operate manually.