I was able to test my front/rear lockers at GOX2. The main test involved a loose rock/dirt 30-40 foot high steep slope with some good sized holes at the top where other 4x4's had spun out. I eased up to it, engaged the lockers and just sort of crawled up it. (This was the first time my wife had ridden with me with lockers. She made some comments about my sanity, got out and filmed it. She stayed in the car on some other milder tests)
One stock Xterra made 3 speed runs at it and spun out.
Jackel (I think) had a welded rear diff and made it on the second try.
Ivan backed off, put the pedal to the metal, charged up spinning and clawing, took a BIG bounce on one of the holes but made it.
I am VERY happy with the lockers.