Currently, I'm doing my ride alongs for EMT-IV certification here in Tennessee. While I can understand the advantages of riding with a bunch of different crews, for myself personally, I've found it more rewarding to stick with the same folks for all of my rides. Not only is it great to get along with the people I'm working with, a basic level of trust is developed, and I like to think they're a little more at ease with having me around, simply because they know how I'm going to act and what I'm capable of. As for how they've treated me, they pretty much let me do anything I want, within my scope of course, and as long as it isn't too off the wall. I think the most important part of the experience, as has been stated before in the thread, is patient interaction. It's easy enough to go down a checklist of do's and don'ts for treatment, but the hardest thing for me to do is to find a nice flow of conversation with the patient. As my preceptor said, "If it's an awkward silence for you, it's awkward for them as well." Other than that, just make sure us students don't kill anyone or blow up the ambulance, then you should be all right.