Mantis Q40 and iOS? Orbit's Optima? Other braille displays?

I'm looking into a new braille display, and since I prefer a QWERTY keyboard over braille input, I'm a little interested in the Mantis Q40. Does anyone own it and use it with iOS? any quirks to know about? Does the QWERTY input actually work with iOS? (I own an apex QT where it doesn't.) https://www.aph.org/product/mantis-q40

I also saw that Orbit Research is coming out with, basically, a screenless windows 11 laptop with a built-in braille display (the Optima) but that isn't shipping til 2024. Not sure if it might be worth waiting to see what it looks like when it comes out. https://www.orbitresearch.com/product/optima/

Alternately, what braille displays are currently worth looking at? My primary interests are basic reading on the device (bonus if it supports epub) and using it on iOS and windows.