Well it all depends on your panel and space, I know in a Super Cup there is not much room, and redesigning a panel for some of the older aircraft can be a bit on the cost prohibitive side! Its all moot ABS-B is set to be the norm in 2019, they are still working out the bugs and its not going to be the cure all some think will be! Look ever since the Wrights invented airplanes these sort of things have occurred! There was one in NYC a few years back between a PA-32-300 and an AS-350 A-Star helicopter, the helicopter chop off the left wing of the PA-32, it was something to see, somebody got it all on video tape! Mid airs are not very pretty, I know of a guy that walked away from one, he was flying a Huges 500c and was clipped by an airplane, he managed to put it down, wrecked the aircraft but he was pretty much alive, same guy flew the opening secquence of Magnum PI, he end up smacking a ridge in Hawaii, that one killed him! He was a good guy, flew with him for a bit 20 years ago!
