Reminds of when I updated the avionics in the company jet.
'So is it TCAS I or II?'
'What's the difference?'
'They do the same thing, but for another $100k the box will tell you to climb or descend and you have to comply."
'Yeah? Last I checked I'm the guy flying the plane, so let's go with TCAS I and save the boss a $100k."