PCAS
D777,
I bought a Traffic Scope about 8 months ago and have found it of limited use.
It provides audio warning of other traffic which tends to make sure your heads outside trying to find it without having to look at the unit and reducing your natural lookout.
I'm surprised at the amount of low level traffic that do not appear to be Transponder equipped. All aircraft that I've flow have had 3a/c transponders.
I'm not sure that I would buy one again.
NTB