No personal experience with classes in the Vegas area, but I know many folks who have attended a bunch of classes at Front Site. Have heard the range of feedback from good to less than good. I haven't been myself, so can't really comment there. That said, regarding needing prerequisites, I don't mind (not that you really have a choice in some cases). I've been through the base/basic/Level I classes for both pistol and carbine with a few training groups and I've learned quite a bit each time. Each trainer has their own way of teaching and to me the value of the trainer is how they assess skills of the individual and can help you improve no matter what your skill level. Even in basic courses, there are ways that more experienced shooters can be challenged by the instructors as well as challenge yourself. I also like that in those classes I can take a step back and either verify basics or work on some basics to hone them to the unconscious level. I've also mostly been to classes where the instructors will demonstrate and explain "their techniques", but I really enjoy those that encourage you to try and see if their way benefits you, but also help you improve not matter the technique you chose or are comfortable with.
As for being fun, I have fun in all of these classes. Even in classes where the trainers aren't that great. As long as they are safe, all good and I'll enjoy the day.
Anyways, good luck and I'm sure you'll have a great time with Mrs. Change. When I've been in classes with couples, it always seems to be entertaining on they end up supporting each other, but also usually being competitive. It's not uncommon for the GF or wife to end up out shooting the guys in the class.