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I'm nothing to do with the business but this is brilliant.
We've checked (work in inv mgt) and the rates are genuinely spot so untouchable from a comparison point of view. You get a card as well which is mastercard so easy to use in shops etc.
I assume they're going to introduce a fee at some point, probably when they have a large enough subscriber base who are regular users and they'll either then add something to the spread or charge a subscription. In the meantime it works very well and is as good as you're going to get from an FX point of view so will hopefully save a few quid here and there. Only iOS and Android at the moment though.