I had an rm07 (adjustable brightness 6.5 moa dot) and an rm02 (auto adjust 8 moa dot.) I much prefer the auto adjusting dot as the buttons on the rm07 would get pressed by the holster etc.
Better advice would be to get a Docter while you still can. Better glass and better product. BOTH my RMR's had to go back to trijicon for repair/replacement.