I've heard of the problem with some old (and I mean old) Hassie backs, some junk brands, and some poorly made rollfilm view camera backs.
I personally have zero problem with either my Pentax 6x7's or my Horseman roll film backs for the 4x5. Roll film is quite thin and generally made of acetate, so if you advanced the film and didn't take the shot, it could hypothetically expand and buckle a little with humidity if it didn't remain under constant tension. I don't see how reverse rollers could be a problem unless they were just poorly engineered to begin with. That may have been an issue at one time long ago, but more likely the alternative was more a marketing ploy, though a straight path does require less physical depth in the back. What you can do is simply remove your film back and look at bright reflections on the face of the film - preferably something with straight lineslike a bank of fluorescent lights - and see if there is any waviness to the reflection.