I own a Kobo glo, and it's a really great ereader! Like most people who love ereaders, I can say it really takes a lot of strain off the eyes. Even with my iPad2, I could never find the right brightness level - just the right brightness but still hurtful to the eyes, or comfortable but too dim.
I chose the Kobo over the Kindle because it's cheaper, it reads most ebook formats, and it has an SD card slot. I got the glo version (with frontlight, like the Kindle Paperwhite) not for the "white paper" effect, but because figuring in a decent book lamp with a standard Kobo woud equal the price of the glo.
The pros are all there: charges quickly, drains in two weeks with heavy use, nice looking highlighted text pages. You can also set the refresh rate (I set mine to every 5 pages) and the fonts and sizes without going into a separate settings page. The only real drawback is the text selection tool. As infrared sensor screens arent as precise as capacitive ones, selection is quite a chore. My Kobo has an issue with WiFi though, so I wasn't able to use the "share your highlighted quote on Facebook" feature, but I was able to try downloading ebooks directly from the device using the built-in web browser before the WiFi feature went bonkers, and I admit that was pretty cool.
Of course for comics and graphic novels, it won't really work, as the screen is too small and the processor too slow. I'd much rather buy a nice tablet to read such material, as Mirasol-type displays aren't up to par with OLED yet in terms of color reproduction.