I've been using a Reflex II for over two years. It's mounted on my rifle that I use at work as a police officer. I do not use the polarizing filter. Frankly I don't have any problems with it. The situations that tend to wash out the triangle make the sights real easy to pick up. I'm not afraid to use irons
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Most of my shifts are worked during the hours of darkness. The big reason I like it is no batteries. I've come to find out that every where I go at work I have a partner and his name is Murphy. I figure the simpler the sight, the less chance I'll have for it to go buns up. I've only had one problem with the sight thus far. One afternoon last winter at a barricaded gunman I was working my way around a pine tree and a big ball of snow fell right on my sight filling up the hole that emits the light for the triangle. It was a pain to clean out. I just knocked the snow off it and had to use the irons. Fortunately, I cleaned the lenses with an anit-fog cloth. This enabled me to see the iron sights.
I have to admit, I've been looking at the ACOG's, not because I'm dissatisfied with the Reflex II, the ACOG's are just a darn nice sight! One of the big pluss for the Reflex II with the goose neck mount is that being between the carrying handle and the front sights provides a modicum of protection, where as the ACOG's sit on top of the carry handle. Flat tops are not an option as my department mandates the A2 style rifle.