Yes, it does help with working memory. I'm not sure if it adds a slot, or makes it harder for other items to sneak into the limited slots, but it helps.

It gives me some control over my focus, leverage against the executive dysfunction, and the choice to not chase dopamine.

For me it definitely does, it seems like my brain is able to fit more into its "main memory" while focused on a task, whereas without it it seems like I'm "swapping to disk" to put it into computer terms.

I don't take it on the weekends, and I feel a huge difference in my ability to remember what I'm working on around the house.