Gisela 6 years of results?

Gisela originated in Germany and was introduced by Wang Jiaxi, director of Shandong Fruit Research Institute in the 1990s. This is a hybrid cherry dwarfing rootstock, known as Gisela series, including Gisela 5, Gisela 6, Gisela 7 and Gisela 12. So, what is the result of Gisela 6 years? I. Gisse