Find the page for the yarn in question, check out projects people have made with it, and keep an eye out for comments in the project blurbs about loving or hating the yarn. (Here are all the types of yarn Mission Falls offers - I note they're all marked as discontinued, but you can still go to the appropriate yarn and see the projects.)

ETA: Whoops, disregard -- I hadn't read down the page to see you've already been given this suggestion and a relevant link.