I used the software two weeks ago on a site with good SEO, original and unique content as well. I only built a small number of links per day (25 or so) that were all high PR, and didn't post to some of the options that could be considered spammy. I backlinked the high PR links with other high PR links. The site got blown out of the serps, but I would still consider this a dance, as the site is only about six and a half months old. I have continued to build other links to keep link velocity up.
I was getting one in ten links verified, but these are all high PR links, this was without using captcha services. I found that by actually entering the email account I had assigned to GSA, GSA wasn't verifying all links and I had to do some manually. This increased link count by another five to ten percent.
As you see above, it's hard to tell just yet how useful GSA has been, but I had been looking at a lot of other software prior to using GSA, and for what GSA does, I think it'll be hard too find another software that competes on equal terms. The shear link diversity and the ability to dictate high PR and then create multiple tiers is something else. I'll let you know if I stop bouncing.