There's a reason why its pulsing. It makes the laser a lot easier to acquire. Honestly, i feel it's better this way. In a high stress situation, you don't want a bland laser that you kinda have to look for. But when its blinking, it makes it easier to see. Accuracy is dead on, i've gotten it to about 50 yards and can still hit dead on.The laser is very bright at night, and can be seen quite far, (as in all the way down my street block) although i rather doubt the any handgun bullet's capacity to stay accurate that far. Anyway, I like it because there's nothing funny protruding out from the gun. Everything is internal, and as many others said, the design is ingenious. I'm not sure how the fit in the SIG, but in my Sigma it works just like a glock, you replace the takedown lever. Nothing to fumble for, just a quick switch, (nothing to snag onto). Battery lasts pretty long too. However, one thing i DID have to change was my ammunition load. The new recoil spring was rather veryyyyy tight, and i had to use stronger loads in my ammunition in order to help break in the spring. After about two boxes, and a week of leaving the slide racked back, I was able to use weaker loads again. Keep in mind that this wsa a 9mm. So i'm sure the big guys with .45 should have no problem at all. Anyone know if these thing's break easily?