You should be cautious buying used cartridges, since they age over the years even if they remain unused. Typically suspension components used can dry out over time regardless of usage which affects cantilever damping and resultant tracking ability.
Yes, I understand all that.
A couple of years ago, I purchased a SAE 1000lt (NOS) HO MC cartridge (made by Coral of Japan) for $200, for which I received the same warnings. Turned out to be an incredible deal, and many other people here also bought them. The reviews were universally very positive, and considered a "giant killer" by many.
I was hoping to hear impressions from people on a purely sound quality standpoint, with the assumption that it is in like new condition.