Amazingly powerful. Easy to use (Granular or static or both) options for blocking all those hidden behind-the-scenes tracking sites. There is flexibility with all that power and it allows you to remove just cosmetic elements and images so that your pages load quicker. It is a little work but not tedious. Also loading filter/rules from the repositories does light years of work for you. If sites block you and give you popups because uBlock Origin is on just load the "Greasemonkey" addon (with the correct script) and you should be able to bypass their annoying counter measure. Enjoy.