It was somewhat brief. A few us are running shallow sand beds (myself included), and seemed to be seeing better sps color than running barebottom. While others said the opposite, they were running barebottom tank and seeing much better coloration.
We talked about anaroebic bacteria vs. anoxic bacteria (I am sure the spelling is all screwed up) benefits in dsb.
Conclusion - everyone runs their tanks differently and to each their own.