Double Piano Stool

There are several types of piano stools and benches available, most of them are made to seat one person. What is the advantage of using a double piano stool over a regular piano bench? Mostly, the advantages are that double benches are wider, and so they accommodate two people more comfortably, and that most models feature the option to adjust the height of the two seating areas independently. This is ideal for piano teachers who share their bench with different sized students.
Double Piano Stool:

Double Piano Stool pictured: Mahogany Deluxe Duet Two Seated Double Adjustable Artist Piano Bench by CPS