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In general, I find that Kindle has the best backlight, is fastest, and has a generally very smooth UI. Now, I haven't used the latest version of the OS, so that might have changed, but in general all the non-Kindle E-Ink devices I've used, I've wished it were a Kindle without the spy stuff.

I'm with you. But, as others have noted, there are ways around it, even before there's a jailbreak available:

(1) Never connect the device to the Internet. There's really no reason to.

(2) Use KFX Output in Calibre, blocking access to the Amazon servers. This is a bit of a hassle but it is doable. Especially since books take hours to read, so you're really only doing the work for a few minutes to get hours of spy-free enjoyment.