(Please note that references to the original developers, Zeobit, also now refer to Kromtech Alliance Corp, who acquired MacKeeper and PCKeeper from ZeoBit LLC in early 2013.) MacKeeper has been described by various sources as highly invasive malware* that can de-stablize your operating system, adding that it is unethically marketed, with a history of making false advertising claims, by a company called Zeobit, and a rip-off.
The only utility you must run on a system is a backup utility, and only backed up systems should be troubleshooted with system management utilities, as you may have a hardware problem causing the other system issues, and the only way to isolate hardware or software issues is on a backed up system, otherwise you may completely make your data inaccessible by accident.
Not only is it expensive for what it purports to do (freeware applications that do the same or more are readily available), it can sometimes install itself without the user realising it, and it can be very tricky to get rid of. Many users will see references to an application called MacKeeper on various web sites and via pop-ups on their browser.
