Love mine too - Burris 300205 XTS-135 1X - 30mm Tube Matte Xtreme Tactical SpeedDot Sight

I bought this sight on sale from another sight/retailer/parts company for $70.00 less than advertised here and approximately 3-4 years ago.I immediately mounted it to my DPMS O.R. Carbine and only had to add a small riser section to get it where my eyes need it. I LOVE this thing, I researched and looked at every other sight from ACOG to Aimpoint and EOtech and found this to be not only far lower in price but equal to or better in quality,visibility and ease of use. I took it to the range and zeroed it without any real problems. I had to first honor the process and find the ammo my particular rifle "likes" and then start actually "zeroing". I am an Instructor to civilian,Security and Law Enforcement with over 30+ years of Instructing experience so I realize that zeroing any rifle/optics types is not a "throw it on and it will work" deal, and really; I find the process of getting behind the rifle with various ammo choices is the fun!
The clicks for adjustment of both windage and elevation are positive and hold zero. Once I found the right ammo and took the time to compensate for the barrel/sight "offset"; it zeroed and has stayed in place with only minor tweaking if the sessions are farther apart than 60 days. I do not now (or when mounted) did I expect this red dot sight to work like a precision scope at 200 yards. I know that is NOT its purpose. I am consistently able to hit an NRA "tombstone" target with shoot n see overlay and cover the group of 30 or more rounds with the palm of my hand at 50 yards. Beyond that range is NOT what I want this sight for and is irrelevant. This is a C.Q.B. sight and is superior for that purpose. the dot works very well outdoors in bright sunlight at the highest setting and indoors brightness across the range of intensity is superb. It can take the rigors of range and training so I have zero complaints. If you want this to do what a precision rifle scope does you are expecting something unreasonable. I have a scoped 223 bolt action rifle, and use a scope when I want to on my D.P.M.S. and remove the Burris when I do. No re zeroing problems.Well done Burris!