You're inevitably going to get people asking about whether the stallion has been color tested or not, especially on colored studs. Not that it matters much, the red ones have beat the yellow/buckskin/black ones many many times before!
LWO (lethal white overo) test is going to start being more sought after, especially with how many solid horses are producing lethal white foals that owners had no idea could happen. All breeding horses should have it done, unless one has been tested n/n. Even solid horses with no history of visible overo in their pedigree can carry it.