One of the first things I've noticed is that the app lacks a night mode (a dark theme). I think that would be really great. It's somewhat hard to concentrate on the text with a bright white screen blinding me in the dark.
It would be really nice if the app would ignore archived texts, or even better, move them to a different section of the app, so that we can revisit them if we want to.
Maybe ability to paste text into the app as well?
I noticed some reviews suggesting a pause at the end of the sentence or after longer/unusual words. That might be a good idea, although I didn't really suffer from the lack of those pauses.
Apart from that, I just went through a long(ish) text at 550 WPM without a hitch, so it works as advertised. Nicely done!
Maybe adding a disclaimer to the API section would help then. those were fairly prominently displayed when I first started them and I couldn't finish either of them.
Apigee API (2/21) and WebShell API (5/7) are throwing random errors. By the way, I have reported these 2 times before and no one had replied or even acknowledged my reports.
I like the re-design, I really do, but it's hard to be impressed when the same lessons that were broken a year ago are still broken and impossible to finish.