I'm so glad to have been able to have the pattern tested in this way. So far my testers have highlighted areas of the pattern that needed improvement, which I have done. They've also spotted a slight mistake in the instructions and made other suggestions.
I would encourage every knitting or crochet designer to have their patterns tested. No matter how many times you proof read your pattern, there will always be something that someone else spots or improvement that can be made.
The problem with pattern testing is that for designers like myself who are independent and just starting out, hiring testers isn't an option with our limited financial resources.
That's one reason why I love Ravelry's Pattern Testers Group. First and foremost it's free, you don't have to pay to test a pattern or have a pattern tested. For a designer this means knowing that your design works and getting immediate feedback. For testers it means getting new patterns before they are available to anyone else.
The other great thing about this group is the fact that it is moderated and there are rules and regulations that both designers and testers must follow. You also set the boundaries of your test, such as how many people you want, the time frame, the specific feedback you require and so on.
There may be other free testing sites out there but this is the one that I will stick with for my future designs.