The strikefire is a nice scope and Vortex has a great warranty. The problem is that I'm now on my 3rd unit in less than a year. The first one started flickering on and off with every shot. It go so bad that would flicker when dryfiring my CZ 858. The second one lasted about 500 rounds and then formed some really strange artifacts in the lens (a bright red halo on the outside of the sight picture).
Maybe it's just bad luck, but I have not been impressed with the durability of the strikefire. I do have to say, however, that Vortex's customer service is phenomenal. They replaced the product twice with no questions asked. Turn around time was also awesome both times (<1 week).