I have seen two ITP lights die . One , an A2 , was in the hands of a mechanic , the other , an A3 , a carpenter .
Both of the lights received rough use . I had bought them at Shiningbeam . I emailed Bryan , and he replaced both lights for free .
I told my friends not to throw their new lights around , and so far , (several months later ) so good .
I use the Olight i2 as one of my keychain lights. It's a nice AA, but it is a twisty if that bothers her. I use alkalines in mine, never had any issues. Then there is always the TK41
You have a flashlight attached to a flashlight. Awesome.
Redundant backup.
Fenix E01 is the toughest. Never heard of one breaking...and there have been some serious torture tests.
I like my A3 better for obvious reasons, but the E01 is built like a tank in comparison.