Well... I got to finally work the drivetrain hard in the sand. Nothing like 5psi, 4wd engaged, soft dry sand, up a dune to put a load on everything.
Wish we could post videos because I got a few but at least I can say that the difference btw the 4r and the 6r is night and day. Street tests get so squirrelly because you get going so fast but on soft sand and 5psi the load is there and I can at least be in 4th at 75mph and actually have time to look at things like the tach or mph w/o needing 100% of my attention to staying in my lane.
I will call Baumann/USShift tomorrow (already sent them an email) about some small issues they might not be aware of. It really does give you the best of an auto and a full manual... with safety features designed in like preventing over-revving, etc. With full manual control no matter what the RPM's are, attacking a dune is much simpler and effective because it won't shift unless you "tell" it to in manual mode.
You heard it here first (well, maybe not) but I call Kevin or Karl at USShift every year

and ask when they are going to design a controller with an LED readout that you can actually read w/o trying to focus in on 1/8" tall letters on a screen while driving down a highway or a narrow trail... guess what??!! They will release one this winter and another larger more feature packed and constructed of nicer materials readout in the spring/summer of 2021 they're hoping. The new LED readout can be mounted anywhere unlike their controller with wires protruding from 3 sides.

UPDATE on this Jan 2021... bad news, Kevin said another year before it comes out... dang.
Anyway, Caleb called me back and said they should have it out this winter. We will have to upgrade our controllers is the "catch"... he said they will try to keep costs reasonable.
So now I can bury my controller again in the bottom of my console (I'll mount it this time in there) and have all my switches mounted to do the shifting, kicking out of O/D, pick different shift tables, etc for a cleaner look. Been waiting 11 yrs for this.