I love these devices!!
The ONLY issue I have with the convertible Netbooks is the lack of a transreflective screen for outdoor use. Still, given the $400ish price range these Netbooks represent a far better/practical option over more pricey, less functional eink based readers. Unless your needs require outdoor use then until a good either transreflective or true reflective LCD displays become an option for netbook devices. If that does happen it really puts the screws to eink devices, especially given their current price points and locking them into a particular online book store...
I do expect eventually there will be a merging of eink and the convertible netbook class devices but that's still a few years out I imagine.