Got a Kindle myself, one of the older 3rd generation ones with the keyboard along the bottom. My views:
1) e-ink is fantastic - really utterly fantastic. When I first got my Kindle I tried peeling the display cover off the screen; until I realised that it wasn't one of those see-through stick on displays, but the actual screen itself. It's really as good as reading paper and doesn't have any of that harsh light that a LCD screen has. So you can read for hours and hours.
2) I like the paddle design along the sides for scrolling back and forward in pages; I'm not as much as fan of touchscreens for that. However most of the Kindle units are now touchscreen - an annoyance but sadly one one will have to live with.
3) Go new - Kindle Paperwhite. The lighting effect will be very useful in dim or dark conditions where you can simply turn the light on and keep reading, without having to fuss with lights or tricky angles.
4) Reflections from very bright light sources (sun) are about the only problem; easily solved too with a small shift in your viewing angle.
5) Avoid PDF or anything with extensive image use. Sadly good as they are for novels they are not quite there yet with images within text. It's a shame, but if you're reading text novels its also not much of a problem either.
6) Battery life is very long (esp if you leave the wi-fi off and honestly you only need that on if you're downloading a book) and no problems there.
7) To my mind the 3G versions are not worth it. Most of the time if you're in a country that has 3G coverage you'll have access to the internet if you want to update your book collection. So its only saving you very short gaps of time; and chances are you won't buy that many books whilst out and about.
8) Ereaders are nice and light - you can read big books without any finger strain, plus they slip into a pocket very easily (well at least any pocket a normal paper back could fit into - jeans still have yet to learn the concept of usable pockets....).
9) Get yourself a copy of the free to use
http://calibre-ebook.com I find it of great use for organising and filling in meta-data for if you get text documents that are not sold on the Kindle Store (eg all those legions of copyright expired free books).
Overall Kindle all the way for me; although really any dedicated proper e-ink reader would be a great choice and far superior to tablets. One additional bonus is that most e-readers really only do reading. They don't do much else. Even the Kindle units with speakers don't really make much use of them (the version I have as a very crude music player feature and I don't think they've really pushed for that in latter versions at all - esp since the overall storage size on the unit hasn't gone up). This means you won't get distracted by apps or emails or facebook - you can get down to some solid reading.
