I'm not sure the term for your style pool - I've seen it both ways. Typically Grecian refers to a rectangular pool with the 'corners cut out', meaning that the corners are flat angles not curved. Anyhow...
I have a 'Grecian' vinyl (with the flat corners) and my Dolphin does a fine job. It doesn't turn the corners everytime, but most of the time. I would imagine the extra traction that the Dolphin would get with a Gunite pool would make it negeotiate those even better.
With curved in corners, I'm not sure.
Remember that the majority of the concern will be with the bottom. Most cleaning at the water line and the sides will be with a brush about once a week (Maybe less depending on your bather load).
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