TKX

Is anyone have the TKX installed and driving? How do you like it? Does it shift as advertised? Can you power shift it and beat on it? Two reasons that I may want one, don't like repairing my small bearing retainer 833 when something happens. Two, overdrive. Have read DC's thread on his install, and others. I would still do something with the cross member, even though I have a GERST front suspension.
What kind of RPM change 4-5th?