The ease of use. I love that the interface is so straightforward and intuitive. It's a very easy program to learn. I don't think I've used it for anything other than basic spreadsheets and it serves me well. There are a few minor quirks here and there, but nothing I couldn't fix with a little bit of research. The best part? The product is backed by a company that cares. They are always here to help with minor issues and will help you learn how to use the product. I'd recommend giving Hit-office a try if you're looking for a simple and easy tool to manage multiple clients. We've been able to keep track of our time, projects and expenses easily. We've saved money on office supplies since we don't have to buy as many.