This is my first e-reader, so I can't make any comparisons.
I got the DX because I am a software developer. One of the uses will be to show PDF documentation, so that I don't have to flip back and forth between windows on my PC. Haven't tried that yet.
Screen: Very clear and enjoyable. I have good vision, but still find it more comfortable to read with the just above middle size type. The auto shift between portrait and landscape modes is cute, but not a big deal. When it goes to sleep Kindle puts a random picture of an author or book related picture up, which is fun.
Controls: Not having had a reader with controls on both sides, I have been happy with the right side controls, even though I am left handed. Easy to put in highlights, which is a habit with me. Haven't used notes yet.
Kindle Store: Haven't used it yet and don't really expect to use it much. Most of the stuff I want is available free, either at sites like this or on technical sites (for the computer stuff). Maybe I will find out I'm wrong.
Accessories: Funny how I paid so much for the DX, but think the leather covers are too steep.
Plus, I have heard of folks breaking their Kindle by opening the cover backward. I had a spare case from my eee netbook which the Kindle fit perfectly.
Whines: Amazon should include a simple cover with the Kindle. It comes with no cover at all. Cheap!
Also, would like a way to put the Kindle to sleep. Maybe there is one and I just haven't figured it out. A couple of times I have found myself a page or two ahead of where I stopped reading because the next page key got depressed through my cover (which is not thin).
Over all, love it, and I love e-reading. When I got the Kindle, I was a bit sheepish, because I thought it was too expensive. Now I wouldn't be without it!!!
