I've bought the majority of my eBooks from them. I've never had to use their customer service so I can't comment on that side of things but in general I have found them very good to buy from.
I suppose that they could have a better browsing interface, navigating around the site when you haven't got a particular book in mind can feel 'clunky' but as long as they have what I'm looking for at a decent price that's what matters most to me.
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