Streamlight CS has been GTG to me as well.
- TLR-2 mounted on my Springfield MC Operator, the red laser stopped working while shooting but the light still did. Emailed Streamlight, sent it to them and I got it back within 2 weeks fixed. I also had a Surefire X300 mounted to the same MC Operator at one time that I had to send back because I noticed the inner lens was cracking after shooting. Surefire CS was good to go in that instance as well.
- One of my older TLR-1s developed a crack on the switch tailcap. This was after thousands of rounds mounted on one of my Glock 19s. I emailed Streamlight and they sent me a new tailcap assembly.
Both companies make good stuff and have good CS in my experience. However others have reported recent shit CS from Surefire and I mainly buy and use Streamlight and Fenix these days.