Even if it is easy to change the size and it is a solid plate, it is satisfied well enough, but plywood will take more than double time. Although I understood from the shape, it was not a true circle unless the vibration was firmly held firmly and it had to penetrate at a stroke with the electric tool waiting for hands.
It is possible to pierce sharply without breaking the periphery of the hole with good cutting. Easy to use because you can set the size of the hole freely. It's a bit expensive but I think it's a price that can be convinced of the beauty of the finish.