In the dairy industry, most farmers do not get as good a result from using sexed semen, but alot use it. If normal conception is say 60% then sexed semen is often 40 to maybe 50%. Other than that, you will get a 10% chance of a bull using sexed female semen... if you are like me then you will be Murphy's Law and get 75% bulls from sexed female semen....
Being more sure of the stage of heat is important, so as to inseminate at the very best timing for conception. It costs more than straight run semen too...
Not trying to be negative, just some things that I have thought of and observed...