McIntosh MC501 vs Wyred SX1000

I am wondering if anyone has compared the Mcintosh amps directly to the W4S units. I am reading some reviews that the W4S amps are remarkably smooth. I know that the 501 pretty much stomped the NuForce unit. The Wyred is supposed to have modifications that set it apart from the NuForce. I Would love to hear some opinions before I make my move................