Peace of mind: That is what Hands-off! gives you.
You can write a very complex set of rules, and the app will do exactly as you say, no resource hogging, no hassle of any kind.
I tried installing little snitch but kept on having problems and issues to even make it run -- after installing Hands-off! the problems were gone and my security greatly increased.
Since you can monitor real-time 'exactly' what kind of network communication each app is having, is very easy for you to block connections to those sites, protocols, or ports you don´t approve. A must-have for someone who wants to keep his or her privacy under strict control.
The interface is very easy to understand, and the network monitoring function really rocks! I tried similar apps before, but definitely I will stay with Hands-off! ´till the end of times.
A couple of times I´ve needed support from them, and their replies have always been accurate and professional -- you don´t get that with other similar products.
Don´t think about it: get it. You will not regret the decision.