It is a heavy duty cutter. I love it on chip board. It was not as effective on single layer of card stock, but should work. You might try it with more than one sheet at a time. I did invites and found it worked best using 3 - 5 sheets at once. Makes it faster to get it done. If you still have problems, contact Zutter directly. The customer support is top rate. They will walk you through and problem shoot with you, and if the cutter is defective, they will take care of that too.
Hope this helps, and congrats on the wedding.