I have heard iPad displays can be difficult to read in direct, bright sunlight I believe. I don't really have a lot of first-hand experience with this, so I don't know.
I have never personally had a problem with the iPhone, but I would advise you try your device in such conditions and see if the display is reasonable.
I have heard that iPads, on bright days, in direct sunlight, when it is HOT outside will give the user a warning that the device is too hot to use. (This is not with my app specifically, just something I have generally heard). I have never had anything like this happen in my iPhone - so again - this is second-hand information not directly related to my app. Just trying to tell you everything I know!
-BKG
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