I find KSS useful when blocking known websites in the category of Social Networking , dating/sex/adult, games,
violence etc but it is lacking to block malicious sites that will scam people e.g. phished sites or websites that will offer rogue programs. Most browsers have malware and fraud protection for this though and also, anti-malware programs with web guard. The image at the left is a sample blocked social networking site and how the blocked message is presented to the end-user. While the image on the other side shows a rogue software's website will load (not blocked by KSS).
The program will use 13MB of memory which is not too much. The internet filtering by keywords or custom sites is powerful so you must be careful in adding new sites or keywords to be blocked by KSS. If you add, *gle.com, you will be blocking google.com!