Who are you, which legal jurisdiction is your company located in? What is your target group? Selling local or global? Every jurisdiction probably has different rules what needs to be included on an invoice.
If you serve the U.S., then you need to calculate all the different sales taxes for each state. If you serve the E.U., you need to create PDF with included standardized XML soon. Don't know about other continents.
I think invoices are not about quick and pretty anymore, but there is a lot more to consider. You should make it clear what you provide and for which target customer.
Im currently talking to all users to make sure the system can provide exactly what they need for each country.
This is also why theres a free trial. To make sure that users see what the system is capable off before they buy it. I never want to take money from people without providing value.
If you serve the U.S., then you need to calculate all the different sales taxes for each state. If you serve the E.U., you need to create PDF with included standardized XML soon. Don't know about other continents.
I think invoices are not about quick and pretty anymore, but there is a lot more to consider. You should make it clear what you provide and for which target customer.