I bought the NYC (MDT) Freightsounds Reefer (1926100) and I kind of enjoyed the sounds. I thought it was a reasonable approximation of the real thing. I posted a video about a year ago of a CSX freight going by,
It's about 4:30 minutes of freight sounds and my new reefer reminded me of that occasion. I haven't tried experimenting with the controls on the car. I just wish you could turn the sounds on and off remotely.