Just installed it and imported my K-9 mail settings. (I had to export a file from K-9, the "From App" option didn't work.) I like the design language much more;

Just installed it and imported my K-9 mail settings. (I had to export a file from K-9, the "From App" option didn't work.) I like the design language much more; it doesn't feel outdated like K-9. The K-9 settings are mostly still there, but some things have definitely been changed. Gone are 1st/2nd class folders, replaced by individual toggles for display, push, sync, and notifications for each folder. I'm guessing the old way might've been confusing for the masses, but it makes it a huge pain to do bulk changes. Otherwise it seems to be pretty much the same functionality wise and I'm cautiously optimistic.