"The large format ebook reader - it's the daddy!"4.5 starson by Jeremy Chappell
Pros: Large display, excellent reading experience. Lightweight with excellent battery life. Huge range of titles.
Cons: Personally I don't like the new colour, it a bit "techie" compared with the older DX. It is still quite pricey, though if you're a avid reader this probably isn't so much of a problem. Why the review even mentions the iPad I don't know.
Summary: The hardware itself isn't the main draw here, as it should be. This device has an excellent large display, it isn't quite as good as actual paper to read, but it isn't that far behind. The refresh cycle is faster than older models and while still slightly distracting it isn't really a problem anymore. The typeface looks great, and has sizes to suit almost all readers. Reading PDFs is a little "hit and miss", especially with PDFs designed for a colour display, but mostly they are okay.
The real attraction of this device isn't actually the device at all, rather the excellent bookstore for Kindle Books, there is a huge selection of titles and they load quickly. It is this that is the secret of why a Kindle is worthwhile and even an e-reader with better specs wouldn't measure up in the short term.
Of course, this device is rather pointless if you're just wanting to read novels - the new "Kindle" been a better bet, but if you're wanting to read textbooks especially those with illustrations, graphs and charts the extra screen size make the Kindle DX a natural fit.
As for as a comparison with the iPad, I don't think the devices compare at all. The iPad is a general purpose device, the Kindle DX is a purely one use device - an e-reader, it does other jobs so poorly that it isn't worth considering them. Conversely if does e-reader so well that for most buyers that's more than enough to justify the cost (or its smaller sibling the "Kindle"). The only caveat being that the iPad does glossy colour - if these are the kinds of books you wish to read then it is a better device for you. For everyone else the light weight, greater battery life and e-ink display of the Kindle DX make it a better choice (as an e-reader). Additionally the iPad has an excellent "Kindle App" and I can see either the Kindle or the Kindle DX appealing to many iPad owners (the books can be read across devices with both keeping in sync with the current position in the text).