So I've watched the youtube videos, so I am well aware of the construction differences, but I finally got to play the two side by side yesterday at the guitar shop. The feel of the two guitars was almost identical. But there was a noticeable difference in the tone. The core seemed to sound warmer to my ears. I don't know if it is $2000 worth of tone difference, but it was there. After playing the two together, I'm seriously considering the S2 instead of the core. Any thoughts or opinions?