I have the Millett 1" dot.
The lenses were misaligned, giving a double image. I sent it back and the new one was better. However there are four tiny screws inside the battery housing that worked loose, making the rheostat wobbly and eventually made it INOP. I took it apart and loctited them and has worked so far.
I can't recommend it. Just too many issues.
I'd have to second the UltraDot recommendation.