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Full user review
"Glary Utilities is a great maintenance tool to use!"
You should develop a regular schedule & have the tools you need to maintain your computer--most (if not all) of what you'll need is available to you for FREE on the internet. These free tools are provided by very highly-respected companies, and will help you keep your computer's system operating at peak performance.
The only cons I can think of are if you don't utilize some of the free tools available to you.
Take care of your computer, and you'll be taking care of yourself. You'll feel far more confident with a well maintained computer.