I like that it's fast, simple to use. It's also very useful how it automatically updates the invoices as they're sent out.It can't be customized much from the GUI interface. It would be great if you could configure more than just the invoice number for your customers. Also, there should be more options in the email that goes to clients when an invoice is past due. I don't have any complaints about the service or the program itself. I've been using this product for several years now for accounting and creating invoices.
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