Anandtech has a good review of the EVGA x58 SLI Motherboard with the integrated Intel chipset.  In the end, they give it a fairly good review (a Silver Rating) but mostly for non-technical reasons (Service & Support).   They found some issues with the S3 resume process and some memory latency issues, but read the full review for the details.

This is our third and final look at the EVGA X58 SLI motherboard. Put simply, in the first set of X58 boards that we received, this was the one board that intrigued us most. After a history of releasing motherboards based on NVIDIA chipsets only, this was their first Intel offering. Not only that, but a fairly new team was assembled to design and manufacture this board.

via AnandTech.

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