I have oily Hair. Most shampoos just cause my hair to be a tangled, knotted mess by the time I get out of my shower. I have tried various Pert Plus products, and I have to say this one is the best for my oily hair. It works very well in medium amounts, and it doesn't hurt the eyes too terribly.
The downside is that after you use this shampoo for a while, some sort of guck begins to build to to the point where you need to use something else to get rid of it. It's just a big deal. I'll just use some sort of Non-Pert conditioner every month or so, and the So Fine shampoo goes back to working perfectly.
On another note, the stuff does not smell great, but it isn't bad, either.
I highly recommend this shampoo to people who have trouble with shampoo causing their hair to get all knotted up.