I had the 33's on for about 5 months before I got the Xtreme A/T. as far as difference in truck preformance I really cant till the difference . Throttle response seems pretty much the same ,,Off roading is a big improvement FerSure. The A/T's do a great job in snow and mud for being a all terrain tire. The tread is alot deeper than the pic shows. I dont drive around town with a heavy foot,, really just like to cruise it,, so someone who puts there foot into it alot might see more of a difference but I really doubt it. Heres the link where I got my proComps
http://4wheelonline.com/Categories.aspx?CategoryId=1517