I've yet to play a Connstellation because they are so rare, but I have heard that they are the nicest alto Conn has ever made. The 28M was more like the 14M directors model alto than the 6M. They were only made just a couple years. the Connstellation came out in 1952 and competed with the highly popular Selmer SBA. At this point in time, the market for profession model saxophones was on the decline. When Selmer released the MK VI in 1954, the successful and still popular MK VI dominated what little professional market was left. Conn discontinued the Connstellation because of slow sales and chose to concentrate on the student-intermediate market. Conn turned to the schools to market their horns, and then a few years later, Selmer took over the school market also with their Bundy line. Selmer tried to purchase Conn many times, and Leland Greenfield even feared that the Selmer company might try to take over Conn. For many years, Conn was Selmer's biggest competitor, even though Conn built horns for Selmer. When Selmer bought Buescher in 1963, the sought to also buy a large share of Conn's student-intermediate market. Kind of shrewed, but that's business I suppose.