Well, I used the Epic with the clear cutting mat it came with and a clear XL Big Shot cutting mat. They are very similar in height. I was cutting a Bigz XL Sizzix die. It was a little hard to get it started, but once I did it worked fine. I'm not too thrilled with the handle. A little flimsy for such a big die. I still like my Big Shot more.
I'll give an update once I use a Quickutz die in it.