Tend to agree that "partial information" on other traffic is virtually useless.
I have to say that, in my experience, use of TCAS outside controlled airspace is a far more valuable tool than in a controlled and separted environment!
It is a shame that manufacturers have not marketed a "poor mans" TCAS, without all the fancy automatic look up/down modes, RA's etc., which would be a fantastic safety asset for GA, in uncontrolled airspace.
UV