Very easy to use, with domain specific filters, including both black and white lists, which is not a very common feature, even on way much bigger extensions.

One "feature" that I didn't like was the self-advertising bar: there is a "lightning" icon that, when clicked, opens an advertisement bar to other products from the same makers, which took me a while to understand that they were not extra functions of this add-on, but external links. The pop-up bubble is definitely not the best place to add that kind of thing.