NetBalancer Pro use to browse and do any Internet activity comfortably even when your download manager or torrent client downloads huge files from Internet just lower their network priority with NetBalancer. You can use NetBalancer to set download or upload transfer rate priority for any applications and monitor their Internet traffic. Applications with a higher network priority will gain more traffic bandwidth than those with a lower one. The main difference between NetBalancer and other traffic shaping software is that NetBalancer works with priorities, so applications with low priority won't be limited if other high priority applications don't use network.
able to block individual programs internet access and throttle instantly and there's the ability to prioritize
main reason I won't purchase is limit of 1 activation ... I've experienced problems with such programs when I have to restore from a backup or reinstall my operating system and so I'd rather avoid such products and avoid them as much as possible unless I have a dire need but as of yet I've able to totally avoid them.
If you really need this program then as long as it works well with your system you'll probably get what you expect but look for alternatives first and try the free version first before making a final decision.