I'd be more than willing to bet if they were anti-prong, you'd know it and they'd be specific about it. By saying "whatever collar you feel comfortable with," it sounds like anything is ok and they just want to check that whatever collar is being used properly?
We're repeating Obed I (different facility) and starting this Monday so I understand your excitement!!! Woohoo, can't WAIT!!!!!!
Bailey is the same way, doggies, doggies! oh boy, doggies! BUT I found that after the first class, he seemed to realize when we went to class, we were going to "work." I made sure to exercise him as hard as I could prior to class and went to class hungry. That helped too, I think. Sure, he would've loved to go sniff, greet and play, but most of the time we were working on *something* and his focus was on me and earning that treat, so he blocked out the other dogs and barely gave them any attention at all. That actually surprised me in a very pleasant way.
I did end up going with a class that is okay with prongs, but even if I had chosen one that wasn't, I'd still take him in
on the prong. Just because of all the people and dogs trying to get in at the same time, etc - I want that control factor. You'll undoubtedly see some owners with their dogs dragging them into the building and you'll be glad you aren't one of them.