Your poll is a little misleading because the title is about malware, but one of the options mentions viruses
The 2 are not the same
That said, running Malwarebytes won't hurt your system and can find and clean much of the common malware
I've run the free version a few times, but never have found anything
If you are experiencing anything unusual, I'd say give it a go and see what you get
Microsoft trying to get more business?I recently had a problem with Google as my default search engine having been changed to Bing. I had originally removed Malwarebytes as I had been told that the Mac OS X had it's own protection (???). It was suggested that I re-install it and was then able to get rid of a small embedded fie in the Safari settings that had changed the default search engine.