One thing: Kindle has no card slot.
I like having quite a large library with hierarchical directory structure on a 32 GB card.
The card also contains about 10 GB of dictionaries.
That is probably the main reason, other reasons can be overcome by hacking Kindle and installing CR, but still, these features are as if deliberately insulting:
- the screen keeps glowing even when the light level is at the minimum - so "e-ink" becomes a false advertising

- no support for the most common e-book formats such as epub and fb2 - so "e-reader" becomes a false advertising
Hm, I suggest switching from Sony to Sony
T1 is a pretty great reader already, unless, perhaps it was not rooted?
The point is: Sony is still the best and there is nothing better to switch to.
I see now: the author of the thread wants to switch from T1 to a device with front light.
I should have stayed away from this thread, as I am an e-ink purist and I completely don't understand people who want front light, sorry
As to Aura HD, there is a dual boot linux/android available. And you choose what to boot by switching the device on while either holding the light button pressed or not.
Because Aura H2O has no light button, the dual-boot may be more problematic or impossible to implement.