These lights (both) really grow on you. I have found the "click" through an unwanted illumination level to become almost automatic. Pointing the light at your leg, or down/back with the Xenon prevents loss of dark adaptation.
The 2L TT is bright enough for almost any application requiring a Xenon. I have all the usual high output SF/SL lights, etc., and find myself using them less, and less.
Not that I don't burn retinas from time to time with the blasters, but the TT's are aptly named; Twin-Task lights.
If you want to spend the bucks, the SF A2 is nice, if they fix the tail cap problem.
BTW- I have heard of ZERO problems with gritty threads, shorting, switch problems, etc. None. Heck of a bargain.