I have the 2nd Oasis model, which I've used as my main reader since they were released. This summer I bought the newest Paperwhite to take on a beach vacation, because the Oasis battery chomps. I get about 15 hours of usable battery life. I keep the light turned up when reading during the day, use a large font, and read quickly, so lots of page turns.
After having the Paperwhite and using it a good deal, I've found I actually prefer the Paperwhite. It's just easier to hold, lighter, etc.
I never thought I would say that. I do like the larger screen of the Oasis, but it doesn't make as much difference as I expected. And I really dislike the page turn buttons, and rarely use them. The form factor is clunky for me, it's too square. When I read at night, I read with my glasses off, with the reader very close to my face. The larger screen means a wider column, which means more eye-travel, which results in muscle fatigue. If I increase the margins to shrink the column width, it defeats the purpose of the larger screen.
I do use the Oasis during the day, but the only feature I really miss is the auto-rotation. With the Paperwhite, screen rotation is done via menus, which isn't that big of a deal.
The Paperwhite is also a much better buy for the money IMO, and they are on sale for $89.99 right now.
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