Yeah, nothing special. I wasted some money today buying a Sony ES series DAT player, roughly similar to the one in the picture above. Caught my eye for how utterly ugly and plain and cheap it was. Also saw a few Sony ES units in a shop that sells (mostly vintage) ultra-high-end and really rare and esoteric stuff, the kind of dreamy rare stuff that most people only ever see online. The guy was demo-ing a Sony ES series CD player that weighed more and was bigger than the Yamaha GT-CD1 sitting near it. Had a big metal case with inner damping, copper plates, thick machined-metal corner sections, etc... I can't imagine for the life of me what such rubbish as lowly Sony ES stuff was doing in a shop like that. Maybe the reverse of slumming?
Okay, obviously I'm being sarcastic. Not all ES stuff was created equal, but at least the best of it was truly GOOD stuff! If what you saw in the thrift shop was like what is in the picture above, and it was at "thrift shop prices", you should go straight back there and get it. If it wasn't at that level, or the prices weren't all that attractive, then look up the model numbers before making a final decision, but the odds are decent that it will be well worth getting.