Players who are not heavily involved in tournaments or team competition. Families who can't afford more expensive instruction. Semi-private lessons are taught by an experienced pro. This format works best if the two players sharing the lesson are close enough in skills to be able to compete with one another. Semi-private lessons offer an effective mixture of peer companionship and individualized instruction.
Cost is shared between two players.
Kids have a peer for company. Lots of individual attention. Almost constant activity for both players. Competing with the lesson partner facilitates intensive singles instruction. The intensive, uninterrupted work needed to fix a stubborn stroking problem can be hard to attain.