I'm really getting back into mine. I had the Nook STR, and it drove me insane. I _like_ being able to delete a book when I'm done with it, and no annoying ads. I also have a Kobo Vox, which is brilliant for reading comics...but the battery life just doesn't hold up for long book reading days.
Also, I find that the Aztak is better at reading in low light. I can read my EZ Reader just fine by my small bedside lamp, when the Nook was hopeless. (I do wish it could read .cbr/.cbz comics though)