It slows down the computer to where it behaves worse than malware or a virus. I've spoken with at least 4 Apple representatives and have verified on multiple Apple and non-Apple online forums that this is absolutely bad for your Mac. Many professionals are considering this actual malware. I am a consumer just like everyone else. I earn my money honestly and don't want other people wasting their hard earned money. FYI-pro-rated refunds are not allowed if the product was purchased over 30 days ago. User's recommendation: Please don't buy this product. It is not necessary if you own a Mac.