This has been great for separating certain categories in a sandbox-like manner so that even if I leave cookies etc from say Facebook (created a container category for Facebook) and I go to my Banking site (in the category of Banking) there is no visibility between the two, so Facebook doesn't get to datamine anything about my banking (also a security precaution, security in layers like an onion), etc. Also this is super simple to use and allows me to organize my tabs more efficiently (I use a lot of tabs).