I'm looking at tactical light and laser combos for my M40, and since this will be my first experience with laser sights, I thought I'd see what brands other people are using on their pistols. I'm looking at the Insight X2 Laser SubCompact because of the price vs features. Insight also makes an M6 that's larger but more expensive. Another option is the Streamlight TLR-2, but again, the price is pretty high. Impactguns.com shows the X2 Laser for $164, the M6 is $250, and the Streamlight TLR-2 goes for about $250 as well. I'm primarily interested in the laser, but a light seems like a good idea as well, so I decided on a combo unit. Anybody using these units on their Ms or does anyone recommend a different brand?