Professor Wylie is easily one of the most approachable professors I've had in my four years at Columbia. She certainly knows her subjects backwards and forwards. Being a classically trained analytic philosopher, her approach toward Women's Studies tends to be more toward inquiry and epistemology within that discipline.
One thing about Professor Wylie, however, is that she likes to talk. She can completely dominate discussion within a class and that tends to cut down on the time for participation. Additionally, that propensity toward lecturing also comes at the cost of potentially interesting discussion, because if you're into Feminist Theory and/or Philosophy of Science, etc, they're subjects that greatly benefit from discussion.
All in all, however, Professor Wylie is a great professor to take; she's an expert in her field, and there is very little chance that you'll ever get to take a class with a feminist philosopher of science again, so your time in class with Professor Wylie is well spent.