Question - Should I Upgrade?

Even though this question specifically refers to upgrading a Mac, Mike makes sure to give some advice to the non Mac user as well.

After reading bad reviews (slow, long app launch times, problems with mail, etc.) I am reluctant to upgrade my Macbook Air from Yosemite to El Capitan. What is your experience? Do you recommend upgrading?
— David from White Bear Lake, MN

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