That is a dangerous modifier if you don’t have all of your ducks lined up in a row…… or the modifier stack sorted the way that it needs to be. There are lots of ways to mess up beveling in general, and not just with the modifier.
Learning and understanding quad topology better is completely critical in my opinion before one can successfully work with such a modifier. Having said that I completely understand the pains of not having it work properly. I end up just beveling on my own most days now.
