I purchased surefire 6PX a week before the free flashlight offer. Comparing them side by side the 511 flashlight has a whiter light and it seems brighter comparing side by side. I like the strobe effect. Overall, very pleased with it.
I have several of these...bright light andthey work well and last long...never had any issues with the flashlight...I have used it in all conditions...never any cracking or problems of any kind...even when I put in between my teeth in some unique situations when I need my hands free...great flashlight!
I got this as a gift from my son. We were really excited about it. First the cap cracked, I sent it in for replacement and got a new cap, now the switch only goes to low power, no strobe and no high power. I am so disappointed I didnt tell my son as he paid alot for a defective flashlight. I have only used the light around the house a few times.... bummmer
This is a great flashlight for a reasonable price. I love the power of the high beam and capability to switch to a lower intensity. I love the high intensity strobe. I like the design of this light, but I am disappointed with the durability of polymer composite body. I had my light less than a year and the body cracked multiple places on sides of flashlight. It also cracked in the threads for battery cap/switch. It still works very well and is my favorite flashlight ever!!!! The sad thing is I don't even use it in a tactical application. So the case needs work on durability and Itvwould be ten times better if it had a pocket clip. Still a good light for the price.