I've only had a chance to use the sight twice and both were bench rest shooting on a new gun so my time is very limited with the product. I shot out to 550 meters the second time out. Field of view, sight picture is what sets this apart from others. Easy to adjust the elevelation without any tools. I would advise using Locktight on the locking screw once zero'ed as it come loose easily!
Overall, I like the medium size red dot. I also have the full lense set in green. I found the green color gets lost in my environment but going to try the smallest green lense for bench rest, long range next time out. At about 300 meters and beyond the medium size dot begins to cover too much of the target for my liking. For target shooting at those ranges I don't think color matters that much.
The sight is large, heavy and built like at tank. It's also the only real con to the product if you are worried about weight, I would like to see them make a lense with a simple chevron similar to this: /\
Hope this helps .