Yeah, "iconic" is a good word for the Supraphonic. It's been on literally hundreds of records, if not thousands. Hal Blaine, John Bonham, and Steve Gadd, among others...
Most rock guys like to point to the 6.5" deep Supra (the LM402) as the holy grail iconic Supra, but I think the 5" deep Supras are just as coveted, because they're good, all-around, versatile drums.
The chrome flakes off the "Ludalloy" (aluminium) shell after so long, and there's nothing that can be done about it. The handle of the throwoff (whether it's the older P-83 or the P-85) can be bent fairly easily, and a number of folks simply don't care for the P-85. I've never experienced any issues with mine, though. If you get one and it doesn't work well for you, you can upgrade to the new P-88, or to an aftermarket throwoff like the Trick, Dunnett, or INDe.
Bottom line: If you are being offered a Supra of any size, so long as it's generally structurally sound it's always a good deal. Other than shell and lugs you can easily replace or fix anything else that might be the matter with it and have a superb, versatile snare in your arsenal.