Hmm call it luck but i never really use anything on my PC's, i have had one virus in about 20 years. New laptop will be here tomorrow, is it really worth tossing it on?
The premium version of this software gives you two things that AV doesn't do. First, maleware and viruses aren't exactly the same. An AV likely won't stop a maleware program, and a maleware program likely wont stop a virus. The different between the two is worth a google search. I don't need to post a wall of text here.
Second, this program will block background internet connections that some websites use that connect to what appear to be maleware sites. This could be things like a website that is known to harvest usage data off computers tries to access a cookie on your system. That isn't virus activity, as it is part of normal internet usage. But Malwarebytes would identify the site being contacted as a Malware site and block the data from being sent.
Every now and then legitimate sites can get some of this activity on them, and not on purpose. Bad code can get in their site, or banner ads can get some bad code. My opinion would be that its worth running the free version of this, and 12$ for a lifetime would serve you well.