I was able to snag a review copy of this service. I haven't previously used a Q&A service, so I was eager to see what kind of affect it could have on the SERPs. I had Flaw3d shoot the links at a site where I'm tracking 5 different terms. It's been about a week since the links went out... and the movement has been pretty nice.
Across all 5 of the terms, I'm probably looking at about 80,000 total exact monthly searches. For only 10 links as a review, my site has moved up a total of...... about 8 spots on the three main terms. On the other terms, it wasn't even ranking, and now they are both sitting at about #125.
I call that a win. The spinning was okay. It wasn't exactly human readable, simply because I'm not working in an easy niche. It has some highly complex terminology on it that isn't going to feature a lot of synonyms. I imagine in any of the "normal" niches the spinning would read perfectly.
I have no complaints! If you want to sling some diversity at your site, try this out. I think it could budge you on up the rankings a good bit.
Thanks, Flaw3d!