I have a Kindle (so does my dh and one of my boys). We all love it SO much. We are readers...lovers of books and all things paper, but the ease and convenience of it is so awesome! When I'm done with a book and want to continue, I just go and download it and start reading...even if it's after midnight! I'm never without something to read when I travel too. When I'm on break at work, I can pick up where I left off on my iPhone too...and when I get home, I sync back to my furthest page read. I do it when I'm waiting at appointments too, or wherever I happen to be.
I just bought an iPad too, so I can upload any of the books I have on my kindle right over to it, and I only took that on my last trip. My dh decided to just take his Kindle and his laptop up to Alaska, so I still have the iPad here, and I've been using it. I'll take it with me next week on my trip.
I'm going to order the Kindle Fire for my dh for his birthday though...I think he'll like having the option of having it backlit.
I chose the Kindle over the Nook, because everytime I saw one for sale, if one was lower priced, it was the one for the Kindle...not the Nook. Not that they don't have good deals too, but if one was lower priced, it was by Amazon not B&N.
We've had great customer service from Amazon too. Both my husbands and my son's Kindle's died on them, and they sent a brand new one out immediately.
ETA: just went and bought the Kindle Fire for my dh, and he'll get it for Christmas. He's going to be up in Alaska until Dec 22, so I'll just send him his new UGG slippers for his birthday instead of this! He's going to love it! I was really impressed with what I was reading at Amazon about it...great deal for the price!