If you use your light everyday in your job then how many years have you had it? And how many times a day do you call on it? Here is my humble Nitecore MH-20 I have had for three years. It goes on and off 25-50 times a day six days a week. The rubber on the button is getting a bit soft but still whole. The holster used to show a carbon fiber pattern but that has long gone. I do a lot of sliding and crawling as you can tell.