Good article on this.....I've always said this about a good V Cut ( Cats Eye )
If you opt to go for a v-cut or a cat's-eye cut on your cigar, you'll notice a change in the concentration of the smoke and the flavors you pull through the cigar. The flavors are richer and fuller; that's because the now-smaller opening you've created in the cap is funneling the smoke through a narrower opening.