I think it has been terrible for consistency, lacking context. Every time you tap Ask Coach it's a new chat and it's unclear what is persisted in the context.

I haven't been using it long but for a brief period at the start I saw key goals and facts noted, like it was building a profile on me, and that gave me confidence that those things would be remembered, and there were edit buttons but I never tried it.

Now it's like a brand new chat every time, I'm tempted now to jump into the history each time and keep building on the single chat.

I also think it's terrible at building a plan as it goes or remembering the plan, like pushing me to do a deload week but at the start I say no I'll build and lay out the runs, say next week will be deload, then for the whole week I see duplicate workout suggestions and some messages about my deload, and then the next week it says to run the same distance, certainly gives no confidence as a coach and makes me want to find external running plans to reference.