Thanks, that's good to know. I know someone once mentioned using Mechanical Turk and that those sometimes ended up being their most loyal users, but I cannot recall the context. Has anyone used these services and what results did you see?
I've tried Feedback Army and was disappointed w/ the results. Not that it isn't a cool idea, but I think the give and take of a good usability test requires that it be done in person. If you watch usability expert Steve Krug doing a demo test (http://network.businessofsoftware.org/video/steve-krug-on-th...), you'll see what I mean.
I recently saw a blog post where someone wrote about the feedback they received and they weren't happy. The same person then revised their questions and tried a more task oriented approach and they were much happier.
Then again, Feedback Army is just a usability testing tool. The right one for the job. I think it's best when a breadth of ideas are needed quickly or you need some ideas about where to start improving your site.
You should use other methods to do testing that requires a lot of depth from one or two people.
Here are a few more posts where folks have written up their experiences:
kartme posted a good post about changes they made with usability testing. they mentioned uservoice which is on turk if I remember, they mentioned doing a followup post explaining more about what the did during testing.
I like their approach using a variety of tools at different stages of product development to get the job done.
I think something our field may benefit from is a guide that explains how to use the different usability services and at what point in the project cycle they should be used.