what things have you guys done on there besides just changing the power levels?

I set mine to defuel all locked shifts, it eases the stress on the tranny, I have my Juice mainly for fuel economy and a little added power boost when towing my 5er.

Just for grins I set it in level 5 did 0-60 in 7.2 seconds, standing 1/4 mile in 16 seconds @ 90 mph. The one thing I did notice there is a significant drop off in accelleration between 60 and 90, 7.2 seconds to 60, and 16 to 90.