Things I liked:Solid construction, easily sighted in, great all around red dot Things I would have changed:I'm not a huge fan of the flip up covers, I would like to see a totally removable lens cover. Also, a simply on/off switch would be nice. Nothing major What others should know:I use this with my KWA M4A1. In using this sight, I was lock onto people quicker than normal. Great red dot! Definitely a steal for ~$30.