I've had my TK41 for about 2 years now. Used it once on a camping trip in 2011 and it's been sitting in my kitchen cabinet ever since.
Great thrower, nice controls & interface, and I like the fact that it uses AA batteries. I also have the Fenix 'lantern' cap for it as well, which also fits on my TM11 perfectly.
However, with the other lights that I now have, and the fact that I don't ever use my TK41, I'm probably going to sell it cheap just to make a few bucks on it so I can get something else.