RE: Extra 300 as a second plane
As the others above have said, this is a pretty poor choice for a second plane. One big problem is that a plane like this requires constant attention from the pilot. And for a new pilot that has just learned to fly the pilot it always trying to keep up with what the plane is doing. In an aerobatic plane like an Extra this is a recipe for trouble. A plane like this needs to be flown where the pilot is always ahead of the plane knowing what they are going to do next with it. Everybody has given great advice about second plane choices..... Something Extra, 4-Star, or a Tiger II are all great choices. These are forgiving planes that are actually quite capable aerobats.
Ken