I have a set on my G19 and have been very happy with them. Pros are they are very fast on target and follow up shots. Con is it takes some time to get adjusted to them and your (mine arent) groups will not be as tight as with a three dot system. I can still hit COM with confidence out to 25 yds. Overall, I am very glad I got them and if I get another EDC (Looking at Sigs), they will also have a Big dot. In my book, it is the best combat sight you can own.