@Mjcmt: The tt is sitting on a piece of 3/4 inch maple plywood, which in turn sits in the sand. The biggest difference I noticed with it is that sound seems to be coming from a blacker more silent background. The soundstage also seems a bit more 3-d. I also think your idea about the black stain sounds pretty cool and I may even give it a shot when time permits.
@Jaxwired: Yeah, I really enjoy these speakers. Excellent clarity without sounding "clinical". As for upgrading, I plan on keeping the speakers for quite a while and getting everything up to par with them.