I'm a freelance photographer and tried several invoicing programs. This one was particularly easy to use (I didn't even realize there was a manual until I used it for a month). I had used quickbooks but it was really overkill for my buisness. This works great and when I needed a feature the response from the developer was quick (discount by line item). I highly recommend this.

Suggestions: I would like to be able to customize the font used on printed invoices. Quarterly sales reports would help too!