Amazon's Kindle Unlimited [View all]

I would like your opinion on “Amazon's Kindle Unlimited” where you pay $9.99 a month and can download to your kindle device (for me it’d be ‘kindle’ on my laptop) a number of ‘kindle books’ ten at a time?
Have you tried it?

I know not all publishers and authors are in the 'kindle unlimited’ listing;
and not all books by a particular author are included.

I buy a lot of used books online and am considering giving it a try. Because I buy the used books at the cheapest shipping rate it can take 2 to 3 weeks for delivery.

Thanks

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