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Bernadette said it well. It won't necessarily hurt you, but user experience is very important. It's helpful to see unique information about each page in the meta when a user searches for something; that way, they know to click on your page for their search. Also, it's a great best practice to give every page a unique meta description and title no matter what.

Hi, It is always good to have nice clean URL's, but I wouldn't advise trying to change them all just for the sake of wanting to change them, especially if they are ranking so well. What could be way better than 1st place? Google has even said in the past, not to change URL's for SEO purposes. If you had a problem because of this, then it might be a different discussion, but for the most part, a URL plays just a tiny part of what Google looks at. I hope this helps. -Andy