Misterblue -
Please reply - it annoys the hell out of me if pilots don't....
a) it's rude
b) it's an instruction
c) if "C/S squawk ident" is the only thing I say in my first transmission to a departing A/C and they do not reply, how do I know they heard me? I cannot use the fact that they display the ident feature as confirmation that they heard me, as that may be coincidence... hell, the crew might be doing it because they did not hear my reply and they want to somehow attract my attention!!!