It's nice if you want something inspirational to hang on the wall, or decorative, but it isn't necessary to build a bike. The actual process breaks down into steps, and normally they don't require full size plans to build from.
If you do get them printed for action, then make sure that there are some detail printed on them that will make it easy to scale the print. and these should work in several directions. dimension on the main triangle would work.i I am taking about scaling the print, so that you know they got it right. I have have several that turned out to be about 90%, and I didn't immediately notice.
It was fairly significant coin to print plans around here, so if it was truly cheap and accurate it would be well worth it.