Also, What is a good forum to follow to stay up to date with new apps / tips for kindle users? (librarycity.org)
The last hard numbers I saw on this was a 2015 survey by tech daily: 84 % of kindle users reported no faults in five years, vs. 75 % of kobo users; moreover, 19 % of kobo users reported a major fault within a year. (blog.the-ebook-reader.com)
Also, not listed here, this app is also available for Amazon kindle users via the Amazon App Market. (thatandroidshow.com)