CSP, X-Content-Type-Options, X-Frame-Options, X-XSS-Protection, Referrer-Policy, Expect-CT, Strict-Transport-Security, & Feature-Policy
Ease of use
Install, enable, configure. Very simple to go from F to A! That said, some pre-reading to understand all the options is a must.
Covers install only - there are so many options, all site-specific, that documenting them would be impossible. Great tooltip help throughout
Value for money
Outstanding! $12/yr? Peanuts for the time and stress it saved. GET IT!