Did you make these yourself or find the website?
I like the order of keys: the way chord progressions go (C7 to F, to Bb etc through the increasing flats then decreasing sharps). Mostly these sort of lists do the sharps first in increasing order, which is not as useful.
It certainly points out how difficult our key signature system has become though: 15 different key signatures! The prospect of having to learn them all must be rather daunting to students.
I like to depict the key circle as a clock but with 0 at the top instead of 12. I write it with the flat keys on the right, sharps on the left. Then the way chord progressions naturally go is clockwise, the way time flows. And I try to make it look simple, by not putting all the enharmonic alternatives, only F#/Gb at 6.
Also, I leave out the relative minors. They are simply 'a quarter of an hour before' the relative majors, just as they are a quarter of an octave 'before' the majors on the keyboard.
John, Australia.