I have been very pleased with the WebTitan filtering product and service provided, the product works very well. I have tested other DNS filtering services and found WebTitan to be the best I have tried in terms of filtering out adult search results and images.
Before selecting WebTitan, I reviewed the capabilities of around 6 DNS based web filtering services. I initially tested other vendor systems and found them to be lacking in terms of not filtering all types of internet searches. When testing WebTitan, I have never experienced a problem where filtering does not work for both web searching and image provision.