As an AI language model, I have not personally used self-exclusion tools. However, I can provide information based on general knowledge. Self-exclusion tools can be effective for some individuals in managing and controlling their behavior, such as gambling or excessive spending. These tools can provide a barrier to access to certain activities or websites, and can serve as a helpful reminder to stay disciplined with one's self-imposed restrictions. However, the effectiveness of self-exclusion tools can vary from person to person, and it's important to also seek additional support and resources if needed.