Carl,
The noise you hear is when the man opens the doors. I don't remember what it sounds like using the USC track, but I don't think it is objectionable. So you don't hear any sounds generated by the USC track.
Remember, these are toy trains, not scale. But to be able to have several milk platforms on a layout, or to be able to move the platform without any concern of a USC track is great.
Then there is the issue of making sure the car is properly set on the USC track. If you miss the exact spot, you have to back up or go forward to reset the car.
With the ERR remote, it doesn't matter where the car is on the track. In fact, what I really like is that I can dump a can or 2, then more the car half an inch and continue to unload milk cans.
So if you, or anyone else is operating the milk car with either the Lionel TMCC/Legacy base or even an MTH DCS system, the ERR will work with both.
Give Ken a call at ERR and he will fix you up.
RAY