Lukian wrote:
And no, you cannot buy it in the AppStore - go and try to find it. (Not in my country version, anyway)
MacKeeper is marketed in the App Store under the name 911 Bundle. I believe it is available worldwide.
It is made by Zeobit, the same developer, and is essentially a 'MacKeeper Lite' that will provide you with persistent nags to purchase its big brother.
I believe that MacKeeper must have a number of satisfied customers, like helenfmb. I fail to see how it could have survived this long without them.
That doesn't change the fact that it has more dissatisfied customers than any other piece of software I've ever come across (at least in the Mac world), and that a large portion of those dissatisfactions are a result of MacKeeper causing severe operational and performance problems that in some cases have led to irretrievable data loss. So much is documented in the comments on my site (link at the end of this post) that others have mentioned, and indeed elsewhere around the web.
If you want to take the risk, go ahead and take the risk. The questions I would ask myself are:
1. What does this program do that really needs doing?
(The answer to this is 'very little', as every mac expert and Genius Store employee will tell you)
2. Can any of the things it does that I actually need be done by either cheaper or safer software?
(The answer to that is yes; just tell us what it is you think you need and we'll tell you what you should actually do; AFAIK, MacKeeper doesn't do anything that can't be done for free).
When people start believing product developers (with an obvious vested interest) over the community of users (who have no obvious vested interest) on the grounds that there must be a "conspiracy", I'd suggest you take a step back and ask yourself which is really the most plausible explanation.
Uninstall instructions for the infected:
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper