It provides an additional research tool, just like any other research tool that people use to find low fares. It also makes comparing carriers more efficient, and if you fly on a carrier which is a member of an alliance, you can fly another alliance member other than your "home carrier" and credit your flying back to your "home carrier" to save money. It also makes it easier to compare regional airports, such as FLL and PBI quickly, and it points out things like length of the layover in red, so it stands out more than it does on many of the airlines own sites, whether a long or a tight layover. I could go on and on, but if you look at this or any particular travel tool as only for a narrow use, then you will get a limited benefit from it, but if you keep an open mind, you will get much more benefit from it.