I had a chance to run my XTZ this past weekend pretty hard with the King shocks. After the initial 20 miles, I lowered the front springs down slightly and then ran the rest of the day and night.
They were awesome, easily outhandling the RZR that spent most of the day trying to keep up with me. I ran just about every type of desert terrain, hillclimbs, sandwashes, fire-roads and dodging pinon trees. The XT tracked well, never felt out of control and absorbed the soft stuff without notice and took the hard hits without beating me up.
The ITP BajaCross Tires and ITP Beadlocks performed great too. You could tell the 8-ply tires were a bit stiff, but when my girlfriend hit a cactus at 45mph, I was quite glad for having that extra toughness.
I'm sold on the King Racing Shocks, best money I've spent on the XTZ.