Jeanne,
I havent used Northside, I believe there are bulls out there from the same farm actually, but it isnt like he is a goat.. A good calf is subjective, if you are selling all your calves at weaning across the scales, Northside is going to do you alot of good, (frame, Length, performance) those calves should be very popular with the buyers in the seats. If you are creating cattle with big EPDs Northside will do you alot of good. I think the growth in the Northsides is real, some more popular big EPD bulls the growth isnt real at all.
Most of our calves now end up on a hook at 14-16 months, he would do me alot of good there as well. Those look to be cattle you could really crank on feed wise and they would just keep humming along.
The other side of the equation does the bull have real muscle? The REA EPD says absolutely (top 4% in the breed for REA), the muscle everyone fawns over is round/rump muscle which is 90% fed on (Fat). You take two bull/steer calves one FS4 (frame score 4)and one FS7 (Frame score 7) you look at them after 100 days on feed and you would swear that the FS4 has more muscle, probably not, the FS7 is just greener because he isnt done growing. The FS4 is putting on fat everywhere. Now ultrasound them the FS7 will probably be a bigger rea.. One last thing about "muscle" the USDA only cares about Ribeye muscle not round/rump muscle.. so round rump muscle shape isnt near as important as width of top and rib shape which Northsides have plenty of (the dozen or so I have seen)
Is he alittle light in the britches, maybe depending on the other half of the equation. (Cow) Jeanne you know there isnt a perfect bull. Everything mating is gonna lack something or need to add something to on the next mating.. Northside is above breed average for 24 out of 28 EPDs, not many Angus bulls will do that.. He is top 25% for 20 out of 28 EPDs, if you believe in the numbers very few bulls will do that at all.
I looked hard at the Northside cattle last year for a friend, found alot of things I liked and a few I didnt, pretty much like any other bull if you look at enough calves. He did end up purchasing a Northside son BTW..