I love my Kobo Aura One for recreational reading of ePubs, but I’ve warned a TeleRead commenter against buying one since he proposes to use it for reading PDFs.
Over at the Digital Reader, Nate Hoffelder agrees. See his YouTube below. While Nate used graphics-heavy material, I was grumpy about the display of text-centric content as well. If nothing else, I found the 7.8 inch screen to be too small.
So now—the inevitable question. What hardware and apps are you reading PDFs with, and what are the pros and cons? For a short PDF, I’m not that picky and might even read them with iBooks or a similar app on my 9.7-inch iPad. But for longer ones, I’d go for GoodReader, which lets you not only read but also annotate, edit, and sign. A tap on the key in the screen shot will open up a test note I made. On a PC, I use Foxit Reader.
Of course, PDFs are a fraction of my book-reading: I cherish the ability of ePub to let me display text just so when I’m using it with a good app.
teleread.org 
I don’t own an iPad, which would probably be my default PDF viewer due to its good PDF-processing combined with portability. The Kindle DX, with its 9.7″ screen is what I use for PDF viewing. The B&N Nook Simple Touch has good software for PDF text-viewing, as you can change the font size on unscanned PDFs and there are very small margins.
Koreader is supposed to improve the PDF viewing experience for Kobos, but it will take me a while to process all the steps needed to install.
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@Reader: Good tips, thanks. Looking forward to hearing from others.
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The 13 inch Sony DPT-S1 is amazing for PDFs well because that’s all it does. The light weight is a huge plus. At around 350g it is comfortable to hold with one hand.
Making annotations is also easy although I am not big on annotations.
My Kindle DX was ok for PDFs but getting a bit too slow and old.
Surprisingly, on 6 inch readers such as my (iriver HD) which do support PDF text reflow most PDFs are quite readable.
I am quite disappointing in Kobo H20 that it does not support PDF reflow natively and will require a 3rd party app such as KOreader.
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I prefer my iPad with iAnnotate, since making annotations is what I do a lot. It’s mainly for reading papers and reports I need to read for work. I don’t read literature/ebooks in PDF and I don’t use my ereaders (Kindle and Kobo devices) for reading PDFs.
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