And while we are at it, don't forget that squawking mode C will keep the bigger boys off you as well. It not unknown for some of our LoCo's to wizz about at speeds which will give a closing speed of 230 kts even if he/she is in your 6 o'clock. I recon getting a Boeing up your bum is a painful experience and one best avoided.
Marvellous stuff TCAS.
PM