I've had my Macbook Pro for about a month now. In that time, I've pretty much adapted to my first non-Windows (XP) environment! I installed (and soon removed) some supposedly helpful apps like "CleanMyDrive" (for external HDDs) and "Memory Clean". Figured they weren't dire requirements. But having been a long time Windows user, I am used to having deep "cleaner" apps (e.g.: Registry Cleaner, CCleaner, TuneUp Utilities, etc.) and they've helped - to an extent - in keeping the machine clutter free (yes, the saved space does help, I guess). Moving onto the Mac, I'd like to know if applications like CleanMyMac or Disk Doctor or OnyX (haven't read good reviews for that one, though!) will be required. Yes, I have read that a Mac is built to "take care of itself", but could you folks please advice whether such utilities make a difference on the Mac like they do on a PC? Thank you.