the combo really lets you work both extremely shallow and deep water at the same time. the 19 degree shines in shallow water letting the cone "open" up more before it hits bottom. the 9 degree stays tighter for those longer echos to the bottom. for example at 20 feet your 19 opens to 6.7 feet across the bottom but with a 9 degree you would need to go 40 feet to get similar readings. also when fishing sharp drop offs a 9 really shines because it lessens your deadspots. so i guess yes its worth the extra. how to choose a ducer angle