Do you mean stacked cabinets, or just doors with a divider panel so that there are two squares instead of one? How tall are the cabinets there? I think it can look great if you're running them to the ceiling and/or have lots of space---and in fact some cabinetmakers will add the second rail for doors taller than 48" or so for support anyway. If you have room to do, say, a 36" panel topped with a 12" or 15" panel (or more) I think it would look lovely. I've seen them done both with glass on top and glass on the bottom, too. (We decided no glass at all for ours in the end after realizing we're storing pantry items there rather than pretty dishes, though!)