Being honest, I read the spec page and quickly turned to the benchmark section.
For me, the X58 mobos from all manufacturers u can just about slip a piece of paper in between all the benchmarkers if taken as an overall picture. Some peak in somethings, whilst dropping in other areas - but even these highs and lows aren't worth batting an eyelid at imo.
So yeah, good mobo. Very pricey. Layout would be a preference to what u want to do.
Thing for me here is that fundamental tech for peripherals is around the corner, in more than one fashion, and even with some mobos seeming faking the access speeds with bolted on controllers, £300 for what could be "older tech" (in the peripheral pov) is not a sound idea.