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I ended an essay about the pros and cons of the internet with the following sentences:

To cut a long story short, the internet is a mixed-blessing. Used intelligently, it is a boon. Used foolishly, it is a curse.

Is this a good ending of an essay? Are the sentences grammatically correct?

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"To cut a long story short" may seem too informal, depending on the expected style of the essay. Personally I prefer to capitalise "Internet". I wouldn't hyphenate "mixed-blessing". The rest of it is OK.