I have a Sony PRS-650, a Sony PRS-350, an original Nook, and a Viewsonic gTablet.
The two Sony readers are my favorites. They both work the same way, and they are both very comfortable to use. I find that I don't care about the difference in size, and I don't use the card slots or the MP3 player in the 650. If they both disappeared tomorrow and I had to buy a replacement, I'd get the 350 because it's cheaper and more widely available.
The Nook has wireless, and if you allow it, it will synch to your B&N account. This would be great if more than ten percent of the ebooks I owned came from B&N. But most of my collection came from elsewhere. I eventually turned the wireless off to preserve the battery, and have not used it since. I don't like the color touch strip at the bottom and I don't like the stiff page turn buttons. I also find that it feels big and heavy compared to my Sonys. And I put a skin on it because the white case is too bright next to the screen.
The gTablet is nice for reading in the dark. I installed the Aldiko reader software. You just touch the corner to turn the page, instead of having to swipe, and I like this better than the page turns on any of my other devices. But it is heavy and the backlit screen does stress my eyes more.
Wireless is only a useful feature if you get all your books from one source such as Amazon or B&N, or if you travel away from your PC a lot. Neither of these apply to me, so I wouldn't pay extra to have it.
I think that memory size, and card slots, are not important factors in choosing a device, because ebooks just don't need much space, and the limiting factor is actually the library management. Sony does this the best of any of my devices, but it's better still to just do it on the PC.
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