I've always preferred Caecilia Condensed on Kindles over the normal Caecilia because it allowed more characters per line and thus fewer awkward line breaks or huge spaces between words. Bookerly does much the same as far as the normal Caecilia available on Kindle for iOS. I have long wanted Amazon to add Caecilia Condensed to the iOS version of Kindle. It does make for an improvement in character and word spacing, but I still think it looks very much like Caecilia slightly modified. But for me that is okay as Caecilia has long been my favorite Kindle and Kindle for iOS native font.

I still wish Amazon would allow us to adjust the margins down to a more realistic size. Even on my iPhone 6 Plus the stupidly wide margins (even at the most narrow setting) waste so much line space.