I only have the HST rulers. It's the only way I can produce truly perfect HSTs. I love them and think they are very much worth the price. You can get away with a single larger one, but I bought the 2.5, 4.5 and 6.5 bundle at a show and it is so nice & easy to use the exact one you need with a rotating mat. I recently had to cut several hundred 3.5" hsts & I broke down and got the 3.5" ruler. Don't have any of the others, so I can't comment.