I was skeptic about buying a kindle thinking how much I would miss the paperback thing. I tried reading ebooks on laptop and also on mobile even in the kindle app, nothing worked anywhere near the paperback experience. Allured by the pre-order offers, bought this one and I am loving it (it's only the fourth day I am using it though, still I'm loving it). A great thing is that I can change the font and spacing, something that I couldn't do in the paperback. This is my first kindle so can't really compare with other versions. But if you are a paperback fan and thinking whether a kindle is worth it, I would say you must give this one a try and you will definitely love it.
EDIT: It's almost 1.5 months with the Kindle, I read almost everyday and I'm still loving it. The backlight thing has solved many problems that a paperback has: I can sit with my kindle by the dark riverside in the evening, I can switch off my room lights before going to bed and not get up later to switch them off after reading a little, I can read it under a blanket in winter and I can read it in train and flight regardless of whether the ambient lights are on or not. I just hope this device lasts long. If I face any problem with this device later or I stop loving it, I'll update this review.