Tinkered with RM1, have RM2 then RMPPro since they are out.

If you care about colors, do NOT buy that or any other e-ink devices IMHO. The colors are washed out.

If you NEED colors in some situations (e.g. reading research papers with important graphics, charts) or enjoy some hints of colors (e.g. manga covers) then why not. It's way WAY better than black&white for colored contents.

Finally, and that's THE #1 use case, if you take notes or sketch diagrams, and would like a dash of color here and there, then it's literally another dimension.