Well, I haven't used my SB much. I mainly bought it to cut fabric for applique. I was using felt and it cut great but after a few washings it gets fuzzy. So, I finally decided to try fleece. I'm making a fleece scarf for my stepdaughter for Xmas and I didn't want to embroider because then you have the backing on the other side. The SB cut the fleece beautifully.
If anyone's interested, I used much the same method as I did with felt: iron heat'n'bond lite on the back, peel off the paper backing and put the sticky side on the mat. I used a 60 extra long blade, velocity 350, force 140, no multi cut.
Someday I will branch out to vinyl....