The Ghost Ultimate that I have doesn't feature an overtravel stop; however, it does offer a much crisper letoff than does the factory Glock 3.5# connector. I also tried the Rocket, which was installed by Arthur himself. Arthur agreed with me that the Rocket is mushier than either his Ultimate or the Scherer connector.
I use Scherers in all of my Glocks, except one...which is equipped with the Ghost Ultimate.
I carry my G26 completely stock, with the exception of a Lonewolf adjustable trigger stop trigger housing, Wolff guide rod and springs, Scherer connector, G17 trigger bar, Meprolight 10226 sights, and Agrip. Also polish all metal-to-metal contact surfaces in the firing mechanism.