How is it with reading PDFs? I read a lot of books on my iPhone without any problem, but PDFs just don't scale right. I'm starting think about getting some sort of tablet and good PDF handling is high on my requirements.
With the caveat that I don't have a lot of experience with the iPad's pdf support I'd say the Fire's support is solid. I recently read an entire e-book in pdf format on it. The main limitation is that there isn't a lot of screen real estate so if you want to read it on a full page scale you need to tolerate a very small font (this was not a problem for me). A cool upside is that when you get a Fire, Amazon creates an email address that you can send emails with attached pdfs and documents which will then automatically be downloaded onto your Kindle.
Overall nothing mind blowing but if you like e-readers I think you'll be satisfied with the pdf support.
The problem with PDFs I have tried is that you have to zoom it for each page. I think a good option would be to have to pdf on something like Scribd and they would convert it to an html5 friendly content, then you just view it on the browser. I haven't tried this yet, though.
Overall nothing mind blowing but if you like e-readers I think you'll be satisfied with the pdf support.