Technical books are so HEAVY and I actually prefer the Kindle for them than carrying those books. Also, reading a huge technical book in say, an airport, would bring you lots of stares ( don't say you don't care about them!)
Yeah it is tough to jump around and some books just cannot be read on a 6" screen ( and I doubt that the DX fares better.) but for most books I found that I am good with reading them on Kindle. The benefits far outweigh the cons for me.
I use my e-ink Kindle for reading stories. For technical or reference manuals it is woefully incapable. Screen sizing for 6 or 7" devices probably makes pdf reading difficult even if it's render-able.
The iPad (ie, any 10" tablet) shines for reading content that's best served as a PDF over ebook format (ie, included pictures, possibly video). Interactive content really does require at least a tablet.
Yeah it is tough to jump around and some books just cannot be read on a 6" screen ( and I doubt that the DX fares better.) but for most books I found that I am good with reading them on Kindle. The benefits far outweigh the cons for me.