Hi there
I have a Hanvon N516... I got it before Christmas last year, but didn't like it much, so in January this year I bought a kindle.
I found it very dark, so reading in poor light was impossible.
It has 3 font sizes.
I don't know about justifications, I like left justified text.
I don't use text to speech, as I like to read. I don't think mine has text to speech.
Page turning is slow, I press the wheel, when I start reading the last line.
It stays open on the book you're reading for approx 2 hours, after which it shuts down... Starting up is slow, so go make a coffee.
It only rotates once, pressing the button again gets it back to normal view.
If you hold down the page turning wheel for a few seconds it'll forward/backward 10 pages.
I don't think I can answer anymore of your questions, as I only used it for a short time.
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