Sony Reader has many followers. And yet one blogger preferred Sony Reader over the Amazon Kindle. Here are the reasons (excerpted from this small Sony Reader review):
...There are a few reasons I chose it [Sony Reader] over the others. It uses the e-ink technology that the Kindle has, but isn't as expensive. The font can change to three different sizes. I can read word documents on it. I can listen to music on it too. I can load about 160 books on it w/out an SD card (though I'm looking into getting one) I was worried about not being able to read my already purchased PDF books, but I found a way around that (I'll email you personally if you want). There's not a glare on the screen (that I've seen)...