I have 10-spoke magnesium Marchesinis on my ST2, and BSTs on my SS. The weigh almost the same (BSTs are 1/2 lb lighter each), but the BSTs have their weight more in the center and so feel slightly lighter.John said:"Three spoke boat anchors" hahaha Mike, well put.
I'm saving up for the ultimate, BST wheels. Anyway I can, one at a time or put them on layaway.
Are they worth it, not sure, but they do look nice with the CF full-fairing.