I actually did an oil change with Rotella T6 5w-40 last night.
Granted I've only driven about 50 miles since the oil change, but I can tell you that my oil pressure is a little higher at idle, and at speed. I don't think I had a pressure issue, but it seems in some ways to be more stabile than when I was running 10w-30 Dino. The engine actually idles better, and it most certainly has silenced the lifters.
So far, all positives in my mind.
I figured "what the heck" worst case is I do an oil change again if its not running well. Wix filter as well (though I always use a WIX, Napa Gold, or the Mopar)
just my .02 cents.
Edit: not that this should be a complete factor, but you can't really beat the price either.