Would be great if (under the advanced invoice options) it was possible to have ‘Payment due on receipt of invoice’ rather than having to set the exact days each time.

I’m cool with the 30 days in most cases but sometimes our first invoice would be an upfront fee so the terms aren’t necessarily needed there and it looks weird if I put it at ‘0’ and it states it has to be paid the day I send it. Sometimes its a little more lax than that :)
Love bullet either way, if you where ever to consider collaborating with a design studio on your branding or UI do keep us in mind!