I am not sure what others have experienced, but I have not been happy with the durability of my CMG Sonic. Great size, and nice beam pattern/brightness (for what it is), but after maybe 2 months the twisty tailcap switch began malfunctioning. Even after asking and getting advice to clean with some alcohol, it is still having problems. If nobody else is having problems, then I will chalk mine up to a dud and probably would buy another. It does have a nice
review.
For now, I am replacing it with a Peak that uses the "N" size battery to retain the very small size. Since AAA are much easier to find, I would suggest taking a close look at the AAA size Peak. It is the only one (besides N) that is still offered in a single LED. The multiple LED lights don't have anywhere near as much spill (flood).
Another flashlight with a built in hat clip is the UK 2AAA eLED flashlight. A
review is available for more information. It is dive rated to well exced your waterproof requirement, and is also from a company known for durable products. It gets a very nice review