I have. I don't track the discoveries very closely, but I did once check to see where I had gotten the guy that is pretty much the cornerstone of my franchise (e.g. draft, trade, FA, discovery). Gold glove shortstop, .300+ hitter (although that has faded over the years, by far the highest career WAR for my franchise.
Like I said, I don't pay close attention to that, or other teams, but that is my in-house experience. As I suppose should be expected, these guys are hits and misses, but this in one case for me that has really paid off.
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