I think I must be the perfect Kobo customer. ;-) The Kobo is my first e-ink reader, and I've only bought books so far from Kobo (and I haven't worried about PDFs yet). Between free books and the good prices I've gotten so far (I've price compared, Kobo's competitive) I'm happy with Kobo. Still want to see the problems fixed though, particularly the ePub problem, as I want my eReader to work properly with an open universal format.
What struck me as funny about the review (apart from Murphy's Law giving him a Kobo with a defective blue button!) was how right-handed people in speculating on left-handed use of a device always manage to make things look so awkward. I'm left-handed (well, closer to ambidextrous, but I write with my left hand), and have no problems with the placement of the blue button. I either use both hands to use the Kobo (either holding it in both hands, or holding it in left hand and page turning with right), or adjust my grip with my left hand in single-handed mode when turning pages, or simply switch to my right hand in single-handed mode. I can't say as how I've observed myself enough to note any marked preference.
When it's all about reading, the Kobo does it all. And the other stuff the others ereaders do? Well, neither Amazon or B&N convinced me those features on their devices were worth the prices they were charging...