Many breeders are fans of the technique while others prefer outcrossing whenever possible.
While inbreeding is done in the hopes of magnifying the strengths of the duplicated individual, it must be remembered that just as likely is a result which magnifies the weakness of the same individual. For this reason, individuals with glaring conformation errors should never be the focus of a planned inbreeding. On its own the presence of the stallion may bring speed and precocity to the foal, but in duplicating the influence, the result often becomes a very quick, very fragile, very expensive foal with a very short track life in front of him. Inbreeding to popular stallions has been done and overdone to a point that has, in my opinion, weakened the end result. Perhaps the time has come to pay more attention to the contributions of outstanding females, and learn to adjust pre-conceived notions of inbreeding to include the distaff influence.