Use it all the time
I read on an iPad in the evening, and on my phone when Im taking a break in the day time, and it syncs nicely. I read library books and ones Ive purchased.
I tried to add a Surface to my mix, but that didnt work out so well.
Its still my app for books.
John MK about
Kindle – Read Books, eBooks, Magazines, Newspapers & Textbooks, v4.19.1