We have observed and had reports from commercial cattle people that Longhorns cross well with Charolais, Angus, Hereford, Black Baldy, etc. The Longhorn bulls we have leased out to commercial breeders in our area have been very well satisfied with Longhorn crosses: Zilch calf losses, no calves having to be pulled, and calves have done well at area sale barns--turned out primarily solid colors.
True--if a LH cross calf turns out "spotted", YES, it will be docked at the sale barn seriously; however, that calf is a good one for your freezer. HOWEVER, getting docked is minor problem compared to dead or sick calves that don't make it (or, a 1st calf heifer that dies or has problems due to having to spit out an 80 to 100# calf).
True--some LH's can have poor tenderness in meat. But, there is nothing like 95 - 98% lean Longhorn ground beef! Flavor and lack of fat in skillet is a big bonus. Very low cholesterol!
JMO ;-)