I find that the 700 is perfectly readable in the same ambient light my 500 was readable in, and the light on the 700 is fine for the same conditions I had to haul out my booklight for the 500 (only with the 700 the light's already there and there's no extra weight nor extra worrying about batteries).
I read for 30 minutes last night with the light on, and for 30 minutes this afternoon without the light on, and the battery is still reading fully charged.
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