I love these boards. Just got them a couple of weeks ago and immediately used 300. Now my totes are easy access and I can move the fabric around without it falling apart and getting messy. It was also a good experience to touch and inspect all my fabrics to "remember" what I owned.
I wrapped up to 3-4 yards on one and no less than 1/2 yard. I was not happy with the 1/2 yard since it was kind of a waste of a board so I stopped doing that. I would now do a yard or more.
I bought the boards on Amazon since hubby gets free shipping but someone here found them at a comic book store cheaper. It was funny that the Amazon reviews were from quilters and not comic book owners.