cleanmymac2

Which review? It was probably paid for by MacPaw.

Articles explaining why Mac OS X does not need maintenance software like CCleaner, MacKeeper or CleanMyMac:

• Five Mac maintenance myths
  [*]The myth of the dirty Mac

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To learn more about Mac OS X: Helpful Information for Any Mac User by GGJstudios​

 

No NO NO, get rid of it as fast as you can, it's rubbish and can damage your System, also do not ever use MacKeeper, it's notorious.

You don't need anything on OS X, it does a good job by itself, if, and only if you run into problems Onyx is the App to use.

 

No.
Do not do it.

 

Best way to FULLY DELETE a program without the need of any additional, inefficient applications

Visual presentation of the steps outlined in above link:

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You don't particularly NEED maintenance software on a Mac, but CleanMyMac (especially the new version) is not so bad actually, it's certainly not a scam semi-malware like MacKeeper and has actually som neat functions and design. I ocassionally use it for certain tasks (such as uninstalling apps, removing languages or slimming iPhoto library) and it never hurt my system. As I said, you don't really need it, and I don't know if it's worth the $30 but I got it with a significant discount and I don't regret that purchase. I wouldn't totally condemn it at once.