In response to some of the posts above:
I've only interacted with the store on a limited basis, but the search results I played with returned the exact same matches between the two apps. There certainly can be a difference between them, but I don't see it yet.
Sorry about the confusion for non-Americans regarding the relationship between Borders and Kobo. I should have described this in my original post. Kobo and Borders are two separate companies. However, in America, they have created a strategic alliance where the Kobo is marketed as Border's ereader, like the Nook is for Barnes and Noble. In reality, Barnes and Noble does own the Nook, but Borders does not own Kobo. So outside of America, it is more than likely that Kobo will be associated with another company or simply stands alone. (also note that Borders does advertise other eReaders as well, so it's not exactly like Barnes and Noble).
I personally have not noticed Kobo being unstable, except that I cannot see the covers of the books in my library. Having said that, although I am reading my current book in Kobo, I don't have a large library to really push the app. In fact, I'm pretty spread out right now between 5 apps for reading, so I only have a small number of books in each.
Hope this helps.
