@Mr. D
I am in total agreement with what Rod says in post #7, above.
If you read his last 2 or 3 sentences — then look at your question: "Is the app "Mac Optimizer" safe, useful?" — the answer becomes "Is Mr D safe, useful?"


No offence, Mr D. I'm really just pointing out that complex cleaning/managerial Apps are really only as good or safe as the person using them.
You can do most, if not all, of what that app does — if you feel you must, in your own time and, you are always in charge. Moreover, if you do get into difficulty, we have vastly more chance of helping you! LOL
Ian