I purchased 3 sinks.  The undermount  edge  is not flat (it is rough and bumpy) so does not sit level against the underside of the granite.  The glazed porcelain should extend a bit more towards the unglazed edge because the unglazed edge is visible at the corners.  Spend the extra few dollars and buy the Kohler version.  I have the same Kohler sink in another bathroom and it is perfect..