I have angus bulls with 0 to -5 ced and bw as high as 5 for use as TERMINAL on my commercial herd. I've found that at 50% or less accuracy the true numbers tend to be closer to breed average than the numbers would lead to beleive. Even if the numbers were true, these size calves are still not as big as most true terminal breeds such as charlois so to me I'm getting terminal with black hide which is a plus. Keep in mind I'm not you're average customer. The last two bulls I bought for $1600 and $2000 at sales where the average was $3500. Most buyers are scared to death of using bulls with these numbers so don't count on selling them for much.
As far as heifers, My home raised heifer bull is ced 2 and bw 2.1. I wouldn't buy a heifer bull with those numbers but I raised him and he only weighed 65, didn't grow extremely fast. Also knew the history of his pedigree so felt comfortable using him. The genomic test is what messed his numbers up. He has worked out very well for us as a heifer bull. Haven't pulled one yet and calves come around the same size as the AI'd sired calves (right answer and aviator).
When you think about it, if the numbers were always exactly correct with 100% accuracy, the difference between a -1 and +5 bw is SIX POUNDS.