To answer your question - in my opinion that site has very little value. If you don't see ads in your daily browsing, your blocking is adequate.
Test sites such as this arbitrarily include domains they think should be blocked, but you may never visit any of those domains during your regular internet usage.
Go to sites known to be riddled with ads and if you don't see ads at those sites you are set. Examples off the top of my head:
cnn.com
speedtest.net
dailymail.co.uk