Tom,
I am an SS8 owner and I also heard the Exotica 3 at audio show recently. While both of them sound excellent and similarity in sound characteristic they are each represent a different taste. The SS8 is softer, lighter and more 3d and transparent. The Exotica on the other hand sounds much more dynamic and aggressive, vocal is a bit heavier tone and texture (compare to SS8) While Exotica bass is more pronounce and seem to have more ball, I felt the SS8's bass is tighter a bit.
Due to their design nature, the SS8 would require a bit more carefull when set up while the Exotica 3 is pretty much plug and play. This is so obvious that in the audio show, where the SS8 stand next to Exotica 3, many philes felt like Exotica 3 is a much better speakers. (When I heard Jim played Jazz variant through E3, my heart was like stopping. At that time, my mind was doubt about my SS8. I went back home, bough the test LP, and like ...wow, the SS8 can do that too). So, my conclusion is, The E3 was born to impress people while the SS8 need time, love and a bit of dedication to appreciate and to let it shine.
Are the E3s better speakers? Yes but are they worth the price to upgrade, that is a question that I still ask myself sometime.