From the Showplace website:

Showplace paint grade cabinet doors and five-piece drawer headers have a solid fine-grain hardwood frame. Center panels and slab headers are of Medium Density Fibercore (MDF), which is an engineered wood product. Face frames and moldings are solid hardwood, and painted end panels are hardwood ply. All other construction details are the same as other Showplace cabinetry...

I think that 'slab headers' are slab style drawer fronts. If that is the case, I'd personally opt to upgrade to 5 piece top drawers...wood vs mdf. Top drawers, especially, seem to take a beating and are more susceptible to getting splashed on/ wet.