The ease of using it. I have created many small invoices and bills for my small business. The system is really simple to use. No more printing receipts or creating pdfs! And no more lost billing statements because they are sent to me through email! Nothing about this software that I dislike. This is by far the best program I have used in many years. I wish there were some other programs to choose from but this one is great. Creating simple invoices has been so much easier with this program. Easybill is a very good tool. The customer support is great. It is a very robust system so you can get a lot out of it. I do not have any complaints with Easybill. We use Easybill for our invoicing. We also use Easybill for our purchase orders. It is very simple to use and the customer service is great. Easybill is very reliable. We use Easybill for our Purchase Orders. I also like that Easybill has a great customer service.