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 grey/black f/s
Valken Proton greyish/black f/s
68 4500 PE stubby, LP output f/s
68 4500 AIR tank(no reg) f/s
Creed Battery, eyes and noid f/s