I've had a 500, a 550 and now a 650. After handling a 600 I passed, due to the glare when I tried it out at the store.
I love my 650, and due to showing it off to people I work with, have ordered 9 of them for myself, friends and family. Using the 650 and Calibre, there are very few books that I do not read on my reader.
The expense is a bit more, but the unit is high quality and solid, and I have had no problems (other than battery replacement with the 500 after 2 years of use) with any of the units I have owned.
My only complaint has been the dearth of covers for the unit. I do not like the fact that the unit comes without a cover, and have looked at several, settling on a Tuff Luv cover. It bulks up the unit, but protects it nicely.
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