I'm 3 months into using strictly Dymatize Elite XT. My poundages/or reps are still climbing every week (I start week 5 of PCT tomorrow - so take that for what you will). 4lbs is about $25 at some online retailers with a discount code.
Now, I'm no fool, but I also don't think a lot of what we worry about, really matters. First ingredient is WPC of unknown percentage. Second ingredient is Soy. The rest are WPI, MC, MPI or C (forget), and E. Some worthless crap like CLA is in there. But, from what I could find, it is not spiked, and Dymatize isn't being "Class Actioned".
To kind of "make up" for any weakness, I've adjusted my macros to allow every protein shake to be made with 8oz of 1% Milk (8g 80/20 Casein/Whey), and 3Tbs (5g) of pasteurized "All Whites". I also only get about 85g of my total protein, from powder.
So, I'll be sticking with it until I think it's jeopardizing my progress - I lift for "me", I don't compete... and been married for 15 years, so chicks...LOL.
(Note: I'm seeing new lables (on Lobliners site, for example) that show a different formulation for DEXT - better proteins listed before Soy. I have yet to receive one of these from the place I buy though...and my jugs are recent production with long expiry dates. I don't know what's up with the new labels/formulation).