I used it for a while when I was starting to get a handle on my finances. It was interesting to see how much it thought I could spare, but I think I had it set to “austerity mode” and found myself running short of cash from time to time. I find a Monzo pot with roundups enabled achieves the same thing.
However, there’s already a thread for this here: ✅ Chip Integration - Automated Micro Savings