I've also had the CT and Lasermax trigger guard units. I don't rely on a laser but do feel there are situations where they are very useful. Personally, I don't want it to come on automatically when I grip the gun. I got my Lasermax for $79 shipped, a much better deal. The CT is a little better built, but I've never had any problems with either. As a Bonus, the Lasermax looks like it is a factory part of the gun.
One more thing about the CT laserguard. The way that on-button is situated, it's sometimes activated by my belt when it's IWB and I'm moving around (I carry appendix, right side). I've run the batteries down that way a couple times...