More than just about any other specialty, rescue diver is one that you can get as little or as much out of as youre willing to invest the effort for. Yes, you can do little tricks like use EAN 36 and take hits off your regulator when you get winded on the surface swims, which may make you look good to the instructors, but does it teach you what your real limits might be in a real emergency?
Ive noticed that rescue students generally fall into two categories. The amateur recreational diver who wants a little better understanding of what can go wrong and some exposure to self rescue or helping their buddy, and the more determined career track diver that approaches the course more like boot camp to learn as much about the course and himself as possible. Neither is a right or wrong approach if the students are honest with themselves about what they want out of the course.