When I used a RDS and co-witnessed it, I lost my cheek weld. Then I got a riser to make up for that. One day I went back to just irons without the riser and it was not only just as fast, it was more accurate. The RDS is a crutch but when people dump $700-900.00 on a crutch, they psychologically justify it as an improvement. If you practice with the irons, it is just as fast You don't need no stinkin' crutch.