Only been using it for about a month so far but it doesn't seem to rank as well on G as well as a homemade one on Wordpress would.
I'm sticking with it as I have paid for it and have invested some time in it, but in hindsight I wouldn't have bothered. I think you really need to find a good product and niche, and it still takes a fair amount of time to setup a new site, even if you're using The Best Spinner.
Launching a new FSB site on Super King Size Bedding this week, but still working on perfecting my own template which I can apply to all my FSB sites and then make a nice Header for them if they seem to be attracting some traffic.
As far as income goes, it's still early days but I still have a long way to go to make my $97 back.