Pros
Scanning options: With AVG AntiVirus for Mac, you can either complete a full scan of your computer, or you can select a file or files to scan independently. This saves you time and lets you avoid repeating scans of the same items over and over again. There are also several options on the Preferences page that allow you to customize your scanning further, including the option to scan for Potentially Unwanted Programs (PUPs) that you may have unintentionally downloaded.
Real-time Protection: Real-time Protection detects and eliminates new threats in real time, so once you've cleaned off your machine, you won't have to worry about new infections taking hold. This feature can be turned on and off as you see fit.
Cons
Slow scans: In testing, a full scan of our Macbook Air took over an hour and returned a result of no threats detected. This seemed long for a relatively small machine without any issues. But once you've completed a full scan once, you won't need to repeat it often.
Bottom Line
AVG AntiVirus is a good free tool for protecting your computer from a wide range of external threats. The file scan option lets you choose exactly what you want to scan, and Real-time Protection safeguards against new threats.
Publisher's Description
From AVG Technologies: Beneath its deceptively simple design lies a powerful security engine that works in real time to detect and remove not only Mac-specific viruses and spyware, but PC and mobile threats, too. So AVG AntiVirus not only helps protect all that's important on your Mac, it also prevents you from infecting friends on other devices. Our award-winning detection technology scans for Mac, PC, and Android-based viruses and spyware. So you can feel better knowing your beloved Mac is protected -- and that you're not sharing viruses with any of your other devices or with your PC and Android friends.