Still much room for improvement, but I know of no better ..

I read the reviews and have to agree with them.
The keyboard lettering is a joke. Light blue or orange on white. I do not know who comes up with so little, and why no one stands out to production.

What I read nowhere but bothers me the most is the display.
Obviously, it was designed for phones in portrait mode and installed in Prime in landscape mode. Thus, the viewing angle is reduced so that the operation is already suffering.
The inverse white on black mode is thus absolutely useless. In direct comparison, the older smaller display of ti nSpire wins by a wide margin.

Said all, the Prime is certainly the best currently available computer. The keyboard is different, but certainly no worse than that of an HP48. I know since 41er countless HP keyboards and yet she is for me the best. (Although I read to other opinions.)
The control complex, rare Used Functions I think solved at nSpire logical, maybe I use it here only for some time.

Extensive calculations are through the touch panel more pleasant. Save almost superfluous. No comparison to the directional pad fumbling a nSpire.