I was never a fan until my wife's S &W M& P 9C came with a set.
She can hold the dot like it was painted on!
And shoots like it too.
Me? I use the spray 'em all over technique. That way one is assured of maximum target coverage.

I wish they made one for my Diamondback 9!
I'd snap it up ASAP.

"wanna hear God laugh? Tell Him you have complete control now!"