Well, I wish I'd had a chance to A/B the two DACs. But alas, one needed to be sold to finance the other. A main reason that I decided to make the change was that I was moving to a computer based system, and the Weiss has a better implementation for playback from a computer. USB on the EE can't do 24/96 or 24/192, and coax, toslink and BNC seemed the better connectors. That's what got me thinking about a more computer focused DAC. By contrast to the EE DAC, the Weiss's strongest input is its Firewire. As for the sound, I think that while the EE DAC is very detailed and the tube option adds a nice warmth to the very detailed Sabre chip, the Weiss has a little more drive and oomph to it. Weiss exhibited a bit more detail, a better lower end, and seemed an all around stronger performer. Again, this was not A/Bing these two directly. I'd recommend checking out the 6moons EE DAC review. I found that Srajan's impressions were close to my own, and they are more reliable since he directly compared the two. The 6moons reviews of the W4S, EE and Weiss DAC2 are all worth looking at, as they include comparisons to each of these DACs discussed here.
Hope this helps.