The extension has allowed me to search Google and get results that I am actually looking for.

However if you want to do any search on Google that isn't the typical "All" search, like say Books, you have to disable before you can try. I had forgotten I had added this extension late one night, and when I went to go do some research a couple days later, which I use Google Books extensively for, I was getting zero results. I spent a couple weeks tearing my hair out and trying to search why it wasn't working before I remembered this extension and disabled it. Things are working fine now that it's disabled.