I did the reverse, went to buy the 350 but ended up with the 650. Overall size of the unit was not a big deal for me (I usually carry a small handbag whenever I carry a book so no change of behaviour for me there) and I liked the bigger screen, I do tend to take a few notes especially when reading for work and I can envisage using the SD card facility in the future.
Cheers, Bernadette
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