Full user review
"Dirty piece of soft"
I couldn't find a pro for this.
People running this software perhaps are not aware that they are scanning thousands of IPs and quite a lot of ports, thus creating trouble. It's a waste of admin's time and a waste of bandwidth and, on top of that, unfair. If you want anonymity, you have much better tools as, for ex. Tor.
By using this, your IP will likely be considered as offensive and therefore, it will be no wonder if you find yourself banned in a lot of sites.