Your eyeballs are good but a traffic warning system will actually show
you how many planes you DIDN'T see. My power club recently got a DA40
with the G1000 and the traffic option. This one still uses the old
mode S TIS system (not TIS-B), but it has made me aware of other
planes I probably would never have spotted if I hadn't been alerted to
them. It's really nice to have an extra set of eyes out there.

Pete