Reservations for Masters are just like any other ARO airport. Get'em as early as you can and don't plan on too many changes or you might get the proverbial delay. Last year wasn't too bad, the year before parking was severely limited. At one point, only passenger drop offs were allowed, then you had to ferry to some other airport. I've heard rumors that traffic will be lighter (economy, war, etc...) so it might not be too bad. Just plan accordingly.
Daniel, Thompson or Aiken SC are good alternates.
Regards,
2000Flyer