I have the trianglations cd; versions 2 and 3; I got 3 because it does 16th of an inch. They work really great. I get the doodle pads from the dollar store and cut them to printer paper size and print out on them. It's cheaper and tears away easier than printer paper. It's easier to have it on hand than trying to run around and find the right size paper; especially when doing tons of them it's easier than doing them without it. I don't know who is charging 58 both of mine together was about that much; the 27 is more in line with the right price