I think that Speed Sights are a gimmick.
In real-life terms, they probably will not make a useful difference to your shooting.
Not only that, but I bet that they will slow your shooting down. "Speed Sights," indeed!
In self-defense shooting, you do not have time to line up little teeny diamonds, all in a row, before firing a life-saving shot.
Self-defense shooting depends more upon quick, crude sight pictures.
Lots of self-defense shots are taken with only the silhouette of the rear of the pistol as a reference.
Those Speed Sights might be of some help, if you were practicing for NRA-style, 25- and 50-yard target shooting.
But I believe that you will find them an impediment in save-your-life shooting.
A wise man once said, "No magic gimmick or miracle-of-the-week will ever absolve you from the need to practice continually, to build and to maintain your shooting skills."