I've playing around with this for a few days just to get acclimated with everything it has to offer. Setup was easy, especially for PayPal integration. The UI and UX is superb, a MAJOR plus!

2 things that were a turn off were:

1] there's no way to use SMTP to use with your business email. This is a major bummer as you're stuck (at least at the moment) having emails with their branding.

2] the email customization has some bugs. When emails are sent, [total amount] and [due date] still show as text as well as the actual total amount and due date. Along with the email branding this may come off as if you're using a trial or stripped down invoicing software.

I'm currently using another invoicing app as it has the 2 features mentioned above
already. I may hold on to the InvoiceQuick so I can use it for my second business, or I'll request a refund if the features I'd like aren't put in.