Bob May owned Stinger? thats news to me. I thought Flesner did.
Here is my experience with Stinger, and I have quite a bit. He made tremendous clubby cows out of angus dams. Right up there and often surpassing the Cunias, Epinals, etc. He was by far the best maine to be used to improve shorthorns. I loved my Stinger cows. He was a hard calver and certainly was for use on mature cows only, and even then keep an eye on things.
Unfortunately you have to take the PHA issue into consideration. I understand DL's opinion, and I will not argue with her, if you are of the belief that using carriers of genetic defects is a mortal sin then dont use it. I personally got lucky in that 2 of the best cows I ever had tested clean.
If I had Stinger semen today (and I wish I did) I would use and test the calves. For me he was good enough to warrant the hassle. I would even keep the carrier females for use as terminal steer producers.
I have known some tremendous Sugar Ray cows. I have often contemplated throwing a stick into an OCC bred cow or too, then I remember how much older and fatter I am now than the last time I used him, and I barely survived then.