What kind of PDFs are you planning to read? As others have said, the real problem is that you have to shrink the document to fit on the screen (unless it's a document designed for a small piece of paper!). If the text is large and the margins wide, it can sometimes work with margin cropping + landscape mode. If you have multiple columns, you can crop down to only one column which helps a lot (but paging around becomes a huge pain). Reflow doesn't really work, sadly.
I do occasionally read PDFs on my 6" Kobo Clara in both the stock firmware and KOreader (I'm very nearsighted), but it isn't something I really enjoy. Textbooks + academic papers are a bad choice; product manuals are sometimes okay. I've never tried a scanned book, but I think it would probably be a frustrating experience.
Maybe try opening some of your PDFs on a computer and then sizing down the window until it matches the size of your desired ereader before committing?
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