A couple of things about pattern testing. Some how it has never seemed quite fair that I spend time money and energy making up and untried pattern for no compensation except for the satisfaction of a job well done. This is especially true for me in the burgeoning business of children's clothing patterns, being without children. That's why I have previously opted for purse/bag patterns. You do get a copy of the finished pattern that you can use.
The other thing you get, sometimes, depending on the designer, is the active participation in the process of making patterns better, clearer and as user friendly as possible. In this case I have to commend Linda Lehn. The group of testers offered her suggestions, gripes, improvements, and any other kind of feedback you can imagine. She took it all on board and used it to improve her finished product. In this respect she's a better woman than I am, and I admire her for it.
