Any e-ink is perfectly readable in direct sunlight. This is a major advantage of e-ink over lcd technology. In direct sunglight I suspect you will see no difference between Sony and Astak.
Now, trying to decide between the Sony and Astak, look at the formats supported by each device. Make sure to note which formats are DRM and which ones are DRM-Free. Based upon your preferred reading check out the various ebookstores to see which formats are available and the prices. Many of the more popular sites are fictionwise, booksonboard, diesel or your local library. Some people make the mistake of buying a particular reader but can't find the specific books they like in that reader's supported format.
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