Dublinpilot
I like your example, and as an SR22 driver, it rings true to me.
This is a real risk.
On the other hand, if the SR22 pilot hasn't seen Paulo, he'll be catching the C150 very quickly indeed
Actually the SR22 pilot will be hearing "Traffic Traffic" in his ears if his SkyWatch is working!
Which brings me to a very important point, many old time pilots still switch their transponders off as part of their approach checks.
IMHO This is the most stupid habit anyone can ever practice, in the crowded area of an airport, having transponders on and TCAS systems fitted can very effectively help a pilot aquire visually all other aircraft in the close proximity of the airport.
If pilots out there do not want to have a mid-air with a fast Cirrus (and there are a lot of us around now) then please leave your transponders on!!! You will probably come out the worst afterall the Cirrus will pull its CAPS and walk away....
Ian