Durability? Obsolescence?

I'm still using my iRiver must be almost 10 years on (plays mp3s for hours, FM radio fine, records my daughter's music lessons for her, only let down by not being usable with Audible). If I thought one of these ebook readers lasted as long--without becoming obsolete--they'd be a reasonable deal.

Thinking about it, £250 was about what I paid for the mp3 player the best part of a decade ago: £25 a year = a couple of quid a month. Not a bad deal for the hardware side of things.