I've bought some of these for IP graphing. They are great... nice quality, thick stock. The price was better than I found it would have been to create and print something similar at home.
Only downside of them is that some people flat out refuse to sign them, especially the baseball ones. They don't like signing "blank" items (and I guess the white portion of the baseball sweet spot or home plate designs qualify to them as "blank". (Maybe if they signed bigger, their signature wouldn't be confined to the white area? IDK.)
At any rate, good product for IP graphing. Haven't tried them for TTM.