These templates are great. I ironed it flat (medium to low heat with a piece of brown paper in-between), which got everything off to a great start.
Using a template is the quickest way to get a project going. Personally, I think I would have spent an inordinate amount of time thinking about what I'd have to do to shape the material for a successful and comfortable bridge. The template meant that after having quick a look at the process, I could just jump right in, trace the pattern on to my material and get on with it.
These templates will definitely be used again. I used transfer paper and a wheel to trace the lines from the tarp template twice now, with different curves each time, and I'll be able to use this bridge template over and over as well. Excellent product.