I am seriously impressed, compared to other free AVs, KAF is not missing anything.
Settings allow to customize everything, that an advanced user might want to.
Not to mention, it is light, like really light, it has got 1% CPU usage at all times, even when playing a game, watching HD video and browsing internet simultaneously, unlike WD, which spikes up to 50% even when coughing.
Though, you might want to "Disable Encrypted connection scanning" (Network settings), for obvious reasons.
The best part for me, it is the only AV, which was able to install and run with my strict settings. Respect.
There was a zero-detection daily webpage, the best AV has got 50%, the rest was crawling around 20%.
Every good AV can detect malware 24-48 hours old, so only zero malware's detection really matters.