I had several people at a match tell me that "you should try blacking out the rear sight" -- this was on my M&P that i have the Speed Sights installed on. They were saying it allows you to focus more on the front and the "old eyes" would work better. So, we walked over to the safe table and I said, "here, sight this...." after one quick movement to sight it, they both were like "wow". So, i got the questions of where did i get them and they popped it into their phones.
I've been hoping that the Speed Sight group would make an adapter plate to be able to put their rear sight into.
Either way, it forms a "tight" picture but since they are diamonds you actually still can see between them, but, the diamonds naturally line up.
I miss shooting my XD(m), but these sights really up my game in fast action shooting -- but, that may also be due to how new I am to the sport.