I've got the Aura H2O - works fine with Calibre
Other than not wanting to directly load Amazon books so they can delete them at will, I like the smaller bezel, lighter weight, and double the on-board memory. And the fact I can read in the bath and not worry about dropping it in, since it's waterproof (to a degree, but sufficient for bath time and being caught in the rain).
Biting the hand that feeds IT
