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.
I think Eric said you'll get maybe an extra pod on a fill. So not a drastic change. It's softer on paint because the xrings provide a rubber shock absorbing feature on the top edge of the bolt. That helps to prevent clipping the second ball in the stack. You can also get the new bolts in other colors as well, which is cool.