The breaking out of business cards works great (if one bends in the right direction, but that is clearly on it), the breaklines are absolutely smooth, looks really professional.
The two-sided printing works well, but I have omitted because of the thickness of the paper to the "Duplex" function of our printer and printed the cards one side and then flipped manually.
I've created a custom template in a page layout program to print to the free downloadable software on the Internet site of Avery I can therefore not say anything.
Who wants to own print business cards, but so far afraid of bad perforation edges had, which I can only recommend this product. You really get so cards like from a pro!