These are interesting lights. I own the the Tube, but it is one of the earlier versions that does not have the lockout feature. The problem I have with exposed buttons is that the light will actuate in my pocket. But using the lockout feature really slows down deployment of the light. Maybe I am impatient, but I want to grab the light and click it on without have to hold down two buttons to disable the lockout.
For a keychain style light, I prefer something like a Fenix E05 as the twisty does not turn on in my pocket, but also does not slow me down when I want to use the light. No lockout is needed.
But lights were my first love, before MTs, SAKs, guns, knives and Maxpedition products. So I'm sure I will grab with a Nitecore Thumb and Tip when the time is right.

I was not aware these lights even existed.