Alright, so I've had several EEE studs in the past, and I never know how to test them. I don't generally have a ton of mares, so only one or two (but usually none) will match the stud's traits, so I'm curious how other people determine whether their stud is a good producer or not?

You usually sell straws in the forum. If that's not possible, the best you can do is advertise advertise in sales on RO day, even offering free breedings if that's what it takes to get those 10 foals. After he's had 10, you can look on LBs to see if he made it to one. Hope this helps!