Back in the day, some 25 years ago, I sold audio at a mid-fi/lower high end retailer. We carried Sony but not the Sony ES line which was carried by a competitor close by.
When someone came in looking for Sony ES, our response was, "What for?" Its the same exact thing as the regular Sony line, the ES just stands for Extra Sides and is more expensive (as the ES line came with nice wooden sides). I'm not sure if that was exactly true or not, but it did keep some people from walking out and going to our competitor :)
When someone came in looking for Sony ES, our response was, "What for?" Its the same exact thing as the regular Sony line, the ES just stands for Extra Sides and is more expensive (as the ES line came with nice wooden sides). I'm not sure if that was exactly true or not, but it did keep some people from walking out and going to our competitor :)