@Kingu@sakurajima.moe i've been a happy kobo user for a long while now, i even own two.
The selling point for me was how hackable they are. But now i also have a few others:

• you can purchase books from other countries without much issues
• Thanks to their partnership with the fnac and rakuten, their french and japanese language libraries are as big, if not bigger than amazon's.

However, i heard that for english language books, amazon holds a near monopoly.
But who cares, almost everything you want to read in english is already on a shadow library anyways