I would like to see one. Advantages: Tilting would be more effective. My ears are not on my ankles. Picking it up would be easier as I wouldn't have to bend down as far. It could stack on a vertical 2x10 expansion cab for a linear 4x10 rig. Smaller stage footprint than a horizontal 2x10. More convenient height for setting a beer on top of it (just kidding). Disadvantages: Can't think of any.