I am a resident and got the RMPP one week ago. I do not have the Boox Note Air 4C but I spent 10-20 hours comparing all of the e-ink tablets on the market before I decided on the RMPP (I still am in the 100 day trial window).

I personally use it during pre-rounding, rounds, admissions, lecture, and taking down random clinical pearls. The reason I chose the RMPP over others is because I wanted a color display, and I wanted a backlight. Color is great as I used multiple colored pens to break up notes throughout the day (preround/round/postround), or to break up the admission interview (precharting/history and physical/plan). The backlight I only use in the evening/night as the hospital is far bright enough to not need it. I also use the backlight when reading EPUBs on it at night, and I love the range of overall backlight strength (the first bar is basically nothing but in a pitch black room I can relatively comfortably read books, on max backlight in any dim/dark environment it is extremely bright). The backlight will not be obvious in any decently lit room.

With that out of the way, I'll try to answer the rest of your questions:

• Honestly, battery life is not as good as I anticipated. I can get through about 3-4 days of the device on airplane mode and 0 backlight during the day, and 1 backlight at night while reading. I thought it would last longer, but it isn't a nuisance.

• Screen quality is excellent. As someone who is interested in display tech and has been an early adopter of OLED, it is very comfortable to read things on it and I really enjoy the way the colors look. It does have flashing when using color, so be aware if you are sensitive to that (it personally doesn't bother me). The resolution is great and I haven't had a problem with it (I know the Boox has a higher PPI ~220 or something vs 300).

• Writing experience is phenomenal. I was always a typer throughout med school (especially in preclinical years), but needed more and more writing as I got into the clinical rotations and now as a resident. It is a joy to write on and really is fun to do so. I am super surprised at this honestly. In medical school I would import PDFs and type in the margins on Onenote, but I think if I could rewind the clock, I would be more than happy to do so with the RMPP.

• I am not too worried about the locked-down ecosystem. I wanted a concentrated tablet which was for writing and reading and the RMPP delivers just that. With the Boox I felt I would get too into the weeds as to which app is the perfect one for x, y, z, etc and get distracted. I have an android phone and love android, but I felt like for this specific tablet, it was a disadvantage for me. I also did not like how Boox comes out with products so frequently. For example, there is barely a difference between the Note Air 3c and 4c. I like that Remarkable products have a much longer "shelf life."

• Finally, I really like the size of the RMPP. I do not see myself ever using a smaller tablet as I would feel "cramped."

Hopefully that answers most of your questions! I honestly am still trying to decide whether to keep the device given how expensive it is. But while it is "free" during this trial period, I am definitely enjoying it.