As a concerned parent of two, coupled with the escalation of dangerous web-surfing, I'm always keeping an eye out for practical ways of protecting my kids without stifling their growth. Yet, I'm a firm believer that no program is perfect, and is a poor substitute for actual parenting.
K9 takes the common route of many internet protection programs by creating an extensive blacklist, but adds an extensive vigilant response from customers or parents with an extensive category system of various levels. I can feel my self surfing and wondering if I should report a certain site, or tell them that the site is just mislabeled. Perhaps many would just ignore it. In my 30 mins. of surfing, I reported two sites I thought were definitely in the wrong categories.
This is probably why the program is free. It takes diligence on the parents' part. At first, I thought that it would be better if K9 just did it accurately and automatically; but then again, as I thought more about it, it indeed all comes down to us, doesn't it?