It's very very small and light on the system, you should definitely give it a shot i am trying out as well and so far loving it
To tightened WSA, you can set the Local/Offline Heuristics to "Warn when new programs execute that are not trusted".
In the Core System Shield enabled the "HOSTS protection.
Set the "Firewall" to ...Unless explicitly allowed.
This gives more control to the user.
Make sure your browsers are Protected in the Identity Shield.
The weakest point in WSA is the Web Threat Shield and some 0days infection take a longer time to be treated but it's normal if it doesn't exceed 6 days or more. Noticed it already mention by PC Magazine.
For general protection WSA is great unless you're in fighting a war with malware in your own backyard.