I own two nooks.
I have few if any problems with the devices.
But the software could use some work.
They need to be able to handle more document types (Word, PDF, etc.) with well designed user interefaces. Right now they depend on selling extra software to do that with is wrong.
In addition, they need to redo their website. I have no problem finding books to buy when I go to their store. I go in, go to the section I desire and browse the "New Books" section. But trying to do it via the device is a waste of time.
Partly because the store only holds a few new books, so they select out the best, ignore the crap, and do not try to 'push' certain books.
On the devices, the opposite happens they don't limit the 'new' books in a section to the good stuff, instead they break the section downs to subsections, and fill the sub sections with every single book available.