When I ordered from EG in London they shipped Royal Mail (ParcelForce) that was deliveredd through the US Postal Service. The duty (customs) was about $25.00 per pair and a handling charge of $5.00 by the USPS.
That's unfortunate. Like TimelessRider, I've never had to pay duty on EG or Pediwear purchases from the UK (both ship via Royal Mail). In fact, the only shoes that I've ever been charged duty on were a pair of Tim Littles that shipped UPS. I don't know if there's a connection. In any event, it's probably only a matter of time before my luck runs out: they're all eligible to be charged duty if Customs decides to inspect them.