Regarding Mill's (was it?) thought experiment about rather being Socrates dissatisfied than some caged subspecies with a non-ending supply of food. My thought is that the objection "YOU can't be (or justifiably imagine yourself as) someone else" is a non-trivial one. In fact, it seems to me a crushing one to the whole thought experiment. You can't be Socrates; you can't have his wisdom and your consciousness since all of it was a package and defined him, as distinct from you. I also have an inkling that this whole division of someone into parts: consciousness, wisdom, emotional control, etc., is a non-helpful one and gives us the wrong picture of our identities. From personal experience I can attest that the addition of life experience has changed my consciousness, as has the addition of book knowledge. So if I had Socrates' wisdom I would have his consciousness (if we must divide it this way) and I would BE him. Isn't it entirely more productive to think about how WE could be happy as ourselves, than to think about thought experiments that violate the most fundamental laws of possibility?