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Yes, which is why I'm curious about how well it works. Also I've not really spent anything since Christmas (NYE was a bag o' cans) so in my case it's not going to be very reliable for now but I presume it works off my spending in previous months too. It's been taking out amounts ranging from £2 - £22 or so.
As @spenceey says there is a setting for aggressiveness so I suppose you adjust that down if you're anticipating big expenses etc.
You can also adjust the split between cash and each of the funds you have picked, I've got it at 50% cash (with a normal savings account somewhere else also)
What's it trying to do? Take what you can 'afford' at that point in time, or something else?