Do amazon kdp free book promotions still work

DO FREE BOOKS GIVEAWAYS WORK

FOR THE FREE BOOK PROMOS:

http://benzackheim.com/prepare-book-kdp-select-free-promotion-days/

http://beckywicks.com/how-i-used-my-kdp-free-promo-days-to-get-over-24000-downloads-and-to-1-in-my-amazon-categories-without-bookbub/

AGAINST:
https://kdp.amazon.com/community/thread.jspa?threadID=189953

http://www.rasmenia.com/2014/11/04/heres-why-i-wont-be-doing-anymore-free-book-promotions-on-amazon/


is 99c/99p the new free
http://mlouisalocke.com/2014/02/25/is-kindle-countdown-the-new-free-keeping-books-visible-in-2014/