It is pretty much useful if you are creating hacks but don't want to get IP Banned.
Free AP Points
Do the same, use Hotspot shield, but this time, you do offers.
Using HSS will change your IP therefore, you can do offers out of your country. I live in India, therefore, the offers I get are 2AP, 3AP and The End.
If you use HSS, you can do US Offers which give you 100APs, 150APs and so on.
GLITCH:-First, let the page load, turn on HSS, click Login on top right corner, type username and details in that box. If you don't do this, you cannot login using normal non pop-up login.