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i agree, if my only wide lens was a fisheye that would be miserable. you said you have a 17-55 or whatever so really if you are looking for something a lot wider you would have to go like 10-22 range for wide angle and not fisheye.
i would only go with a fisheye if i had some money to blow and already had a UWA. my 2 cents. some things look awesome on a fisheye in certain photography but i personally would have more bennefit of a regular wide angle for a lot more uses