I don't even think they notice really. I mean you eventually have to pay to do the class and get credits anyway. Plus, you are taking the time out to do the auditing.

I think it is a proactive approach. I guess it depends on the prof. The sciences are a great start. Hey you can grab a syllabus if you hit the first class and you are golden. I am sure most syllabus's are pretty much the same. And get to know what book is used and get it online ! It has got to help !! I def would do it for the sciences.