Replying to myself . . . I peruse another active board and I had noticed that there is a tremendous amount of talk about the cattle business up to the feedlot. After that it seems like real information or even anecdotal information is hard to find. In my opinion, talk of carcass results often brings up some odd hostility (to big, bad feet, narrow ends, not maternal, etc).
As someone that calves, weans, feeds and finishes -- I have all of those concerns as well as concerns about end product merit.
I have small sample sizes, but I am willing to say that Hoover Dam produced excellent carcass results. Some other sires out of the same cows and the same ration weren't as good. I can even say HD produced some carcasses that rivaled F1 angus/wagyu carcasses.