I switched to soy protein isolate. I got a very good protein that mixes well and has no additives so I have to sweeten it.
OK pro and cons I have noticed
PROS
It does build muscle (not as well as whey)
It is easier on the body (creatine not a byproduct)
A little cheaper
Complete protein (lacking in other needed amino acids)

CONS
Does not build muscle as well as whey
Creatine not a byproduct so easier on the kidneys (this is 1 reason it does not build muscle as well)
E2 went from 17 to 31 (I am not happy with this)