Modern freewheels have a distinct advantage over the older freewheels- nowadays the teeth and profile of the gears are made so that the shifts are a lot easier and more stable- they will rattle less because if it's rattling, the ramps and tooth shaping will tend to shift the gear to the adjacent cog.
That being said, you still need to adjust friction-shifters to the center of the gear or it will annoyingly shift gears unexpectedly.