Semi-OT: Apple iPad

Why all this discussion about the iPad? For the stated purpose (reading PDFs) would not a similar-form-factor _designed specifically for that purpose_ serve much better? By now there are a bunch of "e-readers" with e-ink displays - which one of those is currently best for scanned PDFs (which is what in this context is the primary application!)? I know that many of the current ones have (fairly) low pixel density (thus bad for scanned text even if adequate for OCR'd documents) and many suffer from bad PDF support; but I'd expect that at this stage _someone_ has made one that is of a good size with high resolution. At least most of these now support slapping an SD card full of files into them, right? This way you're not tied to a network (wireless or wired).