I went with this punch as my first corner punch I ever bought knowing that Fiskars makes a really nice product, that stays sharp forever. The first punch you see on the far left does not go all the way through any kind of cardstock, the middle punch goes through halfway, and rips the rest of the way, and the one on the far right seems to do an okay job.
I've tried this on regular light weight computer paper, regular scrapbook cardstock and 65 lb bristol vellum cardstock but and it doesn't seem to make a difference-the problem still remains. I thought I had a defective item, so I took this back, and bought it from a different store-only to find the same problems. Save your money...this punch is defective.
on a POSITIVE note-do buy 4 in 1 corner cutter and embosser Fiskars makes. It works like a dream!