Excellent!
I've used the edges of scissors and allsorts to tear paper edges, which is OK, but this is so handy! I have put a ribbon through the loop and have it around my neck, when distressing, so I always know where it is, and can get my hands free in a jiffy.
I didn't find it hard to learn, I just dragged the edge up and down against the knife, and torn it went. Wehey! *plus I love Tim Holtz stuff*