Libra Color question

Hello everyone! I am considering a new ereader, since my old tolino is small and approaches 10 years of use. I am interested in kobo, since, well, they have a good reputation and are not kindle. I am somewhat visually impaired, I require more light than other people. Reading on paper is quite draining for me, a backlit ereader makes it much more comfortable. I became interested in the libra color, as I wanted to gove colored readers a try. How is it in terms of brightness and contrast, compared to monochrome readers? I am sure the leap in technology will be tremendous anyway.