The units were installed in an aircraft for which they were never intended and in circumstances for which they were not designed.
Really? Mounted on the glareshield looking for traffic wasn't the intent? You mean the advertising and literature is all wrong?
The use of that equipment was precisely the intent of it's design. It's just not very good equipment.
Again, perhaps you just feel badly that you've spent money on something that's not very good; perhaps you're simply emotionally invested in a bad product and somehow feel it reflects on your identity. Who knows?
This doesn't change the fact that it's not a very good product.
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.
With multiple false alarms, one then scans the sky in the wrong place, one's attention misdirected to where the traffic is not...or in the case of missed traffic, there's no alarm and one's attention isn't enhanced one iota. Never the less, one may be deceived into believing otherwise, by those who issue good reports on bad equipment.