I've never used, or seen used, those sheers. The part of just snaping them off sounds good, but I have some serious doubts about smaller pieces. Lots of times you'll need to cut a sliver, or an odd triangle shape that's pretty long and thin. Other times, you'll need to cut a round or concave type shape into your pavers. The more creative and cusom you go, the more weird shapes you will have to cut. I can do all that with my 14 inch metal cutoff saw and 71/4 hand saw. I don't know how you'd do this with a sheer????
Eddie