I do not see any point to this at all. Considering that a right handed shooter is going to need rack the slide with his left hand, he either needs to reach across the top of the gun (whereby he could simply grasp the slide and rack it) or the charging handle would need to be on the left side, which isn’t going to help your holstered carry.
This will change the slide weight and provide one more thing for the slide to hang up on while it is cycling. Thus making your reliable gun less reliable for the sake of some edge case where you are injured and can’t rack with your other hand. I guess the inventor of this monstrosity never heard of racking using the rear sight against equipment.
You can buy one here for $70 if you have more money than sense.
