Yes I have, sorry should have gave more detail;
The performance advantages on the data sheet relate to load balancing in multi-processor systems. Although, interupt moderation could offload the CPU.
I guess my question was to see if anyone has expirience with quad port NICs running PFsense, Untangle or Sophos UTM.
Not sure about UTM use but 2012 essentials loves the PT models , I use 3 PT models that are duals also have 1 ET model dual that has greater VM support ( have them all teamed )