I had a few cheaper blocks and never liked working with them. I have most of the SU blocks now and they are wonderful! I tossed all my old acryic blocks except for one very large one that I got at Michaels. The thickness of the SU blocks can distort the image on the edges when you are looking down at it to stamp, but I just use a larger block to get around that. I think I would just make a mess with very thin blocks like Tim's.
Cindy in Oregon