Better downrange momentum, but IMHO, it just ain't worth it if you satisfied w/ your current set up.

KE just isn't as important as it used to be. Don't get me wrong, it's still important, but w/ the advent of todays high tech, major horsepower compound bows, yer gonna get plenty of KE to kill just pretty much darn near anything. Now, if you're a traditional boy, yeah, it makes a major difference.