I think this is a great way of saving. However I almost left after the first week when I saw how much was being taken from my bank account. I think it would be very useful if there was easy access to a quick estimate as to how much would be taken weekly based on an individual users current settings. Clearly this would differ from user to user but it took me a while to get things set at a level I was comfortable with.
Thank you for your input, there are is always room for improvements. Please let me pass your feedback to our product team.