It's slightly more efficient, use xrings to reduce drag and provide a soft buffer for the stacked balls. Basically it's a better design. Whether it's worth it or not is up to you I guess. It's not going to make any magical transformations in your gun but if you want to be in tip top ultimate shape then grab one.
ETEK 3LT, with 14" critical .680 barrel and cure 3 + bolt F/S