Best budget microdot out there - Primary Arms SLx Micro Red Dot Sight

I have PA's Advanced Microdot on an AR-15 in .223, on a PCC in 9mm, on a .22 rifle, and a .22 pistol. I'm still using the same battery that came with the sight in all cases. It remains clear, stays zeroed, and is easy to adjust. (Both in terms of dot brightness and in terms of zeroing.) Dot can go bright enough to be used on a sunny summer day, but is adjustable down with a simple push button.

The TangoDown rubber cover fits it perfectly well (the cover for the T1), all controls can still be used, replacing the battery is simple if you ever actually have to do it. (I'm thinking that in three more years I'll do it whether it needs it or not.)

I've bashed it around in general practice, USPSA, Steel Challenge, and Multigun competitions. No issues at all. Well worth the price.