I very consciously did not buy a Kindle when choosing an Ereader about a year ago. The Kobo H2O is incredible and has served me very well. The format support is wonderful, and the stock OS does more than I need (though there is a whole community of custom OSes that also look cool). Combined with Calibre, I don't even see what the Kindle value prop is.
The Kindle is inexpensive, has great support, has a huge library (open to non-US people with non-US credit cards), and you could just email a MOBI to it (which is great if the Kindle owner is your parent). It's only disadvantage was that it did not support ePub and so one had to go through Calibre. Now that Kindle is supporting ePUB and no Calibre-tion is needed, I don't even see what the Kobo value prop is.
And Kindle STILL does not support ePub. All Amazon has done is started letting people email epubs to their Kindle and their backend will convert it to an Amazon format. This has conversion warts, means you lose cover support too. You still can't copy an ePub over USB.