Some upgrades improve the reading experience: faster processor allowing for quicker page turns, quicker file management.etc. For example, my Kindle 4 NT is a substantially better e-reading experience for me than my Kindle 3g.
But, I really didn't need the upgrade.
I've had one time where a device upgrade would have/will cost me serious bucks - when Palm decided their new phones would no longer be backward combatible. So, I am holding on to my Centro.
Obsolescence stinks.
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