I've owned two (as the first one had an unfortunate run in with the pavement) and also a Sony E-Reader in the past, and I can wholeheartedly say that for people who read books a lot, and aren't too bothered about collecting the paperback versions, having a Kindle is the best way to go. Yes, they can be expensive to buy (although you could get second hand ones for much cheaper) but they almost always make that back because books in the Kindle store are so much cheaper than print books. On my E-Reader books were normally the same price as their print counterparts, but with my kindle I've found books that were up to £10 in Waterstones or WHSmith are £3-£4 on the Kindle. Plus, weight restrictions are no longer your enemy when taking books on a flight. Basically, I would recommend one, though people are welcome to tell me why they wouldn't.