I use Kobo more than any other shop, including Amazon, mostly thanks to their coupons (not living in an Agency-pricing country, I can use them on any book I like, which really does make Kobo particularly nice). I've never had any problems with BooksOnBoard either but their selection is smaller and prices tend to be higher than Kobo's (especially Kobo's with coupons), so I've bought only a fraction of my books there.
I don't have experience with other epub shops as most of them don't sell to me.
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