I got an Ethernet SmoothStepper from Greg, too. I have it on a BP clone with 4 axis, X/Y, Z quill, A knee, servos. It was pretty straightforward to setup. I was on a USB SmoothStepper. I installed an Intel PCI 10/100/1000 NIC, set it up per Greg's suggestion for Static IP on 10.9.9.8, subnet 255.255.255.0. The ESS is preset for 10.9.9.9, but CAN be changed. The ESS writes a new section to the Mach3 XML, so it takes a restart to get that going. You'll need to re-setup your SS config settings, or at least check them and restart. Greg is working on a smoother transition for UPGRADERS from USB SS here. I run Windows 7 32 bit, and I THINK I had to disable the Windows Firewall to get the ESS setup, but I'm not certain of the steps I was taking so I'm not absolutely certain I couldn't have gotten thru it without turning off the firewall. In any case, I have the Windows Firewall enabled now, as normal and everything is working fine.
I did NOT try to set this up by simply plugging it into my home network, like on a switch or directly to the router. I have it running on it's own separate network/subnet. This seems the best way to do this, and it's what Greg seems to recommend.
All in all, a great looking new and more noise tolerant SmoothStepper.
Tom