I tried quite lots of whey before. elite whey, myofusion, Isoloid and ON whey .below is my humble review abt isoloid compare with ON whey.

Isoloid taste really awesome, amino acid is ultra high (i think isoloid have highest amino acid among all) so i don need waste money on amino acid supplement.
30gram protein and even pure isolate. 
no fat no lactose (I am lactose intolerance ) and very low in carb.
only the mixability of it is slightly bad.
Overall, its really good and effective pure whey isolate. definitely worth to try and its cheap