Erika really is something else. If you have to take university writing, which you do, you should try and take it with her. Her classes are very lively and although the workload for this course can be a little exhausting, she will guide you through it step by step. I was a good writer when I came to Columbia, I am now a much, much better writer.
The major pro with Erika is that she's very much in touch with the student's perspctive because although she's been teaching for a while, she is still a student (PhD). Her general knowledge and research experience in a broad range of topics means she is incredibly helpful in guiding ones research by suggesting avenues of exploration one probably wouldn't have gone down otherwise.