I have used just about every product in their line.
I will say this ... the packaging is catchy as @#$% (I know, I sound like a little girl). But honestly it was a huge selling point for me, it attracted my eye.
As for the formula's and profiles, very good but very basic. Nothing earth shattering, nothing revolutionary but solid ingredients at solid doses (nothing seems underdosed).
Flavors are incredible on the pre's. The proteins are very hit or miss. I love the Peanut Butter cereal, the chocolate is great, the limited edition flavors are awesome ... the only one I personally did not like is the Blueberry Toaster Pastry (although most like it) because it has pieces of pastry in it. And not small pieces either, ones you actually need to chew.
I also used their SIZE product (the only real "muscle building" supplement in the line) which is a glorified creatine product. But it's flavorless and actually seemed very good for the few tubs that I bought.
The line is definitely worth a look. Just for the curiosity aspect alone.
-Spaz