I had a SD64 , and it was a very nice card. it was faster than a picassoII I had before. I think the normal piccolo and the picassoII are the same in speed terms...
picassoII/piccolo used the cirrus logic 5426 or 5428 chip, an ISA bus one, where the SD64 used the 5434, a chip made for the VESA Local bus, thus it is faster.