My Kindle Fire was my first tablet and I fell in love with the 7" form factor (my company gave me an iPad, but I *hate* the size of it).
After using my Fire every day, however, I have decided that I want a full-blown tablet. I was so anxiously awaiting the Memo 370t, and was sad to see it go. (I really, really miss the HDMI out and the SD card slot). When the Nexus 7 was announced, I quickly sold my Fire on craigslist (got $150 for it in less than 12 hours), and have preordered the 16GB N7. I figure that the Kindle app and the Amazon mp3 app will function the same. The only thing I will really be missing is Amazon Instant Video. I really, really enjoyed downloading movies to the Fire and watching them offline. I am still wondering what I am going to do about that. The draw of the full android marketplace was too strong to resist. If it comes down to it, I'll just have to suffer without Amazon Instant Video.