Good luck from me as well. Although I am not looking for a quotation solution, there would be 2 things which would concern me (if I were):

- There is no example how a 'beautiful quotation' looks. - Pricing would be a concern. You say it is free, so why should it be of concern: if I change my business process now to use your interface and then I am locked in, I would really like to know how much I have to pay next year.