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Depends on what you were expecting. I would say that 100% of the field is "usable", but depends on what you want to use it for. There are aberrations as you approach the edge of field, but still those stars near the edge in the peripheral vision do make a difference to me and aberrations are obtrusive only for a few of the brightest stars. And of course you won't be able to get good views of Jupiter on the edge of the field. No EP is perfect to the edge, even the most expensive ones show some aberrations near the very edge of field. Stratus is not as good as a Nagler or a Pentax XW, but they are pretty damn good. And for the price they are superb.
What other EPs have you used?
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