My only complaint is that the on/off switch is so stiff and hard to move that you cannot use the "momentary" on function reliably. When I depress the on/off lever to use the "momentary on" function I have to push so hard that I turn the light on to "constant" on. I do not know if this is normal or defective since this is my first Surefire X300. My Streamlight TRL 1 and Insight M3X worked very smoothly in using the on/off toggle switch. I am going to conatact Surefire and try to get this issue resolved.
Pros: very bright, sturdy, easy to mount
Cons: on/off switch WAY too stiff to move.
This review was written in the old system and had content requirements that are different than reviews written today.