When the light first arrived I was unable to make it function at all but the instruction sheet directed me to a toubleshooting video on the manufacturers website. The problem was quickly resolved after the contact points and threads were cleaned as instructed. The four brightness settings and strobe make this light very versatile. I have been using it as often as I could for the last six weeks or so and it has functioned flawlessly. The solid, rugged construction leads me to believe that I will be getting many years of use out of it. It isn't a cheap light but you get what you pay for and this light is well worth the price.
Pros: impressive bright setting. Separate side switch makes it easy to change modes
Cons: not sure when I would ever use the SOS setting ???
This review was written in the old system and had content requirements that are different than reviews written today.