The paper guides for each punch are elevated from the surrounding surface and as such block the smooth insertion of multiple pages. I did observe the 15-page limit but even 5 pages are blocked.
It was ok but I wish that I would have got the one right above that one because I can not get 15 sheets of paper in it at one time. I actually broke it because mistakenly I left a paper clip in my my papers that I was going to punch a hole in but luckily my friend fixed it for me. Time will tell. I just had bad luck with it but I am glad it is fixed for now.