Parenting a child with developmental disabilities is somewhat different parenting experience and brings with it greater challenges compared to raising a typically developing child. Due to these circumstances, there is a need for support in the process of securing the necessary resources for effective adaptation and overcoming life situations characterized by an increased level of stress. This paper presents the parenting support program "Growing Up Together Plus", intended for parents of children with developmental disabilities, and its goal is to affirm positive and effective parenting and encourage the development of parental competence. The program consists of 11 interactive group workshops. The goal of this qualitative research was to gain insight into the subjective experience of participating in the program from the perspective of parents of children with developmental disabilities. The research questions focused on the perceived benefits of the program for parents as well as their children with disabilities. Results of the thematic analysis of the answers gathered through a questionnaire, which was filled out by 476 parents at the end of the program, are presented in this paper. The results illustrate numerous gains from participating in the program. Key gains include connecting with other parents in a similar life situation, exchanging advice and experiences, receiving group and expert support, acquiring new knowledge and skills, increased parental competence, gaining affirmation and encouragement in the parental role, increased self-insight, reinterpretation of developmental difficulties, better understanding of the child with a developmental disability and developing a better relationship with the child, including progress in communication, the child's development in various areas, and the overall gain for the child in the form of higher quality parenting as a direct result of parental participation in the program.