I've had my 600 for about 3 weeks now, and no i wouldn't consider swapping it for the 300, though to be fair the big thing for me is the size of screen (6 inch gets enough print on it it feel like a paper back book)
I also own a Cybook Gen 3 and to be honest the first time i got the 600 out of its box and switched it on I was disappointed with the screen. (it looked so much better in waterstones) but is just a matter of angle and the screen is just a good.
I have not regrets at all
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