I don't recall a particular issue with the thumbs, but I did notice that the tap did not always register, and someone in another thread suggested that it could be from your non-page-turning thumb over-hanging somewhat and interfering with the IR sensors. I don't know if this is the case or not.
For me, I found that there were some more advanced features I required which I could not get on the Kobo (e.g. multi-language dictionary support) so I was happy to give the device up to its intended owner (I was setting it up for my boss). I do think it's a very solid device for its intended general-user market. I don't think that I am a 'general user' given my needs, however, so this was not the dream device for me. But I respect what Kobo is doing and think that they are on the right track.
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