In general, I love Streamlight. I do have a TRS-1 weapon mount, but what really turned me on (after trying many alternatives) is the ProTac 2 AAA. really long life LED, decent brightness, everyday carry that fits in the shirt pocket with the phone. Hopliphobes don't freak out when I pull it out so my aging eyes can read small labels, etc. I now have a backup of the same model including quite a few others, such as the Intrinsically Safe Dual light, both rechargeable and 3 AA battery version -- IMO, every vehicle should be outfitted with one of these. Most of their products are covered by lifetime warranty (exludes the "key chain, usb rechargeable LED, but I also like them).
It's somewhat painful to rid of perfectly working, old tech flashlights, but LED versions from Streamlight will pay back in cost of batteries before too long.