Bought my first 18” rigid block, and absolutely love it. Good ergonomics, extremely well made, these aren’t some cheap plastic, dropped it a few time onto the concrete from the top of a pick up truck and it didn’t even chip it, super tough. I can’t wait to have all the blocks available. I had originally wet sanded this whole grand national and it was ready to buff, noticed some waves so I figured I would try the linear blocks and their sandpaper, since I’ve tried other adhesive backed sand papers and they never stayed on when wet sanding, these stay on and come off easy.