So far Webwatcher has not disappointed us - we have 6 kids and use this on the younger 3 (15-8). They are also locked out of websites. I go and check their text messages with this and I can see all the pictures they take as well. I can see any link they tried to access and what they search for.
Some may think that is invasive, I call it responsible parenting
I have SEEN police show up at my son's HS because a picture had been passed around and the boys involved got arrested for "child porn". That's right. So I believe it is a way for me to protect my children.
This parenting thing is hard work!