Re: Changing Schools/ "styles"
Probably doesn't need to be explicitly said, but the other thing to keep in mind is that it's their house and their rules. Ettiquette demands that you respect both, even if certain things about the practice don't jibe with your experience or seem silly.
Whenever I'm a guest in someone else's dojo, I do my best to exhibit (and inhabit) that I'm a beginner trying to learn to do what they do in their dojo. So, if a white belt corrects me, I smile and say, "Hai!". Even if something seems "dumb", I still do my darndest to do it their way (as long as it doesn't prevent me from keeping myself safe).
In other words, I try to keep my ego or what I think I know out of the equation. If I don't like what they do, I don't have to go back, but putting your best foot forward in terms of ettiquette seems like a good place to start.