I have a Janome 760 that I take to class. I bought it because I could no longer lug my Brother mechanical to class, it was just too darn heavy.
My primary machine is a Kenmore Elite, it stays home, although in an emergency, I have taken it to class.
I see absolutely no problem with you taking your Janome back and forth. These are sturdy machines, the computerized parts are encased in metal so they are not going to be jostling about with movement. If I didn't have the Elite, I'd be using the 760 at home in and class as well.