I've tried just about every laser out there for use on my home defense hand guns, and have not been entirely happy with any of them. Then I got one of these little fellers:http://www.truglo.com/firearms-lase...p?catid=7C59B41AD2AF4C0F8ADAFD5D6F0186FA
It has stood up to the recoil of my 45ACP's, right on down to the KelTec PMR30. They're easy to install, hold their zero, are very bright, and so I've decided that I'm going to replace all of my other home defense pistol lasers with this one.
What do the rest of you use?