I think SB for the price is well worth it. Like many have said the learning curve is not difficult but requires you to think through a process of actions before you just go blast out posts. For me I found that harvesting url's into manual post sites is by far the most effective. I did an automated post the other day with 5000 WP url's, a majority of them actually indicated posted but going back through the check link the % drops off rapidly, somewhere around 60 confirmed. I didn't even bother checking PR or # of outbound links on those URL's posted, probably make me mad. The other thing is posting 5000 url's takes hours to post, maybe I could tweak my settings but still it's alot of time. The value of finding urls with high PR, low outbound links, and nofollow is the real value of SB for me.
The only thing I don't like is not being able to run the app on multiple computers, seems that it can be activated on only one computer at a time, yet multiple instances can run. This is problem during slow posting since that instance pretty much takes over your computer, an annoying aspect if posting takes hours.