Caution: Relating my own experience only.

Went to buy System Mechanic thru one of the ads in my newsfeed. I've used it for yonks, but lapsed a couple three years ago. Purchased the product thru the Yahoo purchase portal. Didn't know there is such a thing, complete with wallet.
1. McAfee immediately warned me that the download site is dangerous.
2. I was automatically signed up for Norton anti-vi (say what?!!), which is moronic if you're buying System Mechanic. The two aren't even compatible, + SysMech does the same thing as Norton.
3. Cancelled the whole transaction and went over to System Mechanic and bought it for less.
I also reported the incident to System Mechanic.