Project 2020 aims at developing in-service primary school EFL teachers’ profession in Vietnam. This current study investigates in-service teachers’ and administrators’ opinions of different aspects of the project by analyzing their responses to the questionnaire and interviews. Findings show that they are generally in a moderate agreement with aspects of the in-service training program; however, they are concerned about management, training model, and materials and resources. They also want to be given more time to practice and exchange opinions. Their satisfaction with the course greatly depends on the course content. Recommendations are made for future retraining courses.