Close calls
I keep a good lookout to try and avoid those planes. I also did when I was flying the cirrus with it's TCAS. It was incredible that it picked up LOTS of aircraft that I didn't see. In fact one was off to port for a few minutes and I didn't see it for quite a while even though I knew it was there.
Now, this being pprune: the training; my aviation skills; parentage and/or sexual orientation can all be called into question but the fact is take 1 average PPL and I garauntee that we're all missing LOTS more planes than we realise.
Of course, like everything automated, as soon as you start to rely on TCAS, GPS, automatic pilot the question is when it's not there can you still fly the plane ?
Hence why, imho, the look out is superior to the TCAS. Simply because it'll always be there whilst TCAS might not.
Cue lots of posting about the guy that had a stroke whilst flying and lost his sight.