I'm using a Kobo WiFi and my experiences have been mixed, both in general, and specifically regarding Japanese.
There are two things that really bug me about the device. One is a general complaint, and that is that while PDFs are supported, they will not be listed in your library like all your other books. Instead, they will be thrown in a "Documents" section, and stripped of all metadata. It is disorganised, ugly and inconvenient, it bugs me to no end. This is made even more infuriating by its inability to properly display ePub files which have been converted from most other formats(e.g., and especially, PDFs), particularly if the original contains any images at all.
Second is that there is no way to find titles which do not contain latin characters in their title. If you want to import a book with non-Latin characters in its title, too bad. It'll import just fine, but there is no way to actually find it in your library. That said, non-Latin characters do display just fine, and right-to-left text is fully supported, which is nice.
All in all, I would not recommend this device, its lack of touchscreen is very frustrating when filing through menus, as it is exhaustingly tedious to do so given the slow refresh rate of eInk screens. Couple that with almost no moddability whatsoever (and absolutely no useful mods), and you're better off shelling out for either a Kobo Touch or perhaps just go the whole hog and grab a Kindle.
There are two things that really bug me about the device. One is a general complaint, and that is that while PDFs are supported, they will not be listed in your library like all your other books. Instead, they will be thrown in a "Documents" section, and stripped of all metadata. It is disorganised, ugly and inconvenient, it bugs me to no end. This is made even more infuriating by its inability to properly display ePub files which have been converted from most other formats(e.g., and especially, PDFs), particularly if the original contains any images at all.
Second is that there is no way to find titles which do not contain latin characters in their title. If you want to import a book with non-Latin characters in its title, too bad. It'll import just fine, but there is no way to actually find it in your library. That said, non-Latin characters do display just fine, and right-to-left text is fully supported, which is nice.
All in all, I would not recommend this device, its lack of touchscreen is very frustrating when filing through menus, as it is exhaustingly tedious to do so given the slow refresh rate of eInk screens. Couple that with almost no moddability whatsoever (and absolutely no useful mods), and you're better off shelling out for either a Kobo Touch or perhaps just go the whole hog and grab a Kindle.