In these aircraft, nearly every aircraft system was modified, and the exterior of the aircraft had numerous other antennas, attachments, hardpoints, fuel tanks, and equipment above and below the aircraft, attached to wings
The units were installed in an aircraft for which they were never intended and in circumstances for which they were not designed.
That it costs a lot to the average private pilot doesn't change the fact that it's a drop in the bucket compared to a real TCAS. the Xaon PCAS is a gimmick which has some limited use, but may serve more to misdirect and put heads down in the cockpit than it does to actually locate traffic.
Nonesense. It is just wrong to suggest it "puts head down" unless it is badly installed, wrongly used or misunderstood. I realy believe you are guilty of all three.
I dont mind anyone giving something a bad press if they can support their reasons but you cant. You fly the aircraft, deal with the tasks of doing so, scan the sky around the aircraft and if and when you receive an audible alarm scan even more carefully. If the alarm combined with the more careful scan enables you to identify a target you might have otherwise missed all well and good, if it doesnt, no harm has been done.
Honestly it is not rocket science. Heads go down for all sorts of other reasons and people's scans are poor. So the unit beeps, your head comes up or your scan becomes a little more intense. You spot the traffic and the unit has done its job. You dont spot the traffic, but the unit has reminded you of the importance of keeping a scan going - so it has done its job. As the last poster says it is not rocket science.