I've got the Big Dot Tritium Ashley's on my PSP and my accuracy has stayed the same. BUT my target acquisition time has improved.
Man are they fast on target and engagement.
Still shooting half inch groups consistently at the 25 yard line outdoors!
If you CCW your P7, that speed may save your life. coupled with the squeeze cocker slide release and you are smokin into your followup or primary shots.
Love mine without a doubt.