There are several conditions that must be met before I'll buy an ebook reader.
1. Standardized(preferably open) formats
2. Ability to easily transfer books to and from various devices, no matter who made it.
3. I can loan or sell any ebook at any time(First sale doctrine of copyright law). The LendMe feature on the BN Nook does not meet this, read the fine print if you think it does.
4. The ebook can not be deleted, changed, or any limitations added by the device manufacturer or copyright holder after purchase(looking at you, Kindle)
I'm not holding my breath for these conditions to come true, so I'll stick to paper books for now.