It my opinion, software like that will get banned by social bookmarking sites sooner or later. Unless you got money to burn, save your money and use that for new domains or something.
I know it's not recommended to use any sort of automated tool, but if you're not doing hundreds per day I doubt it really matters. I use socialbot by incansoft and it works GREAT... Sad thing is you have to go and sign up for like 75 bookmarking accounts before you can use it on autopilot. But i made my staff to that.