The best thing about this app in my opinion are all of its functions related to the business office! I can use it for billing purposes as well as invoicing customers. It's also very easy to keep track of payments received which makes managing cash flow much easier than having paper records scattered around your desk at work. As far as any complaints go, there really isn't anything that stands out right now but if you're looking for something specific feel free to reach out via live chat or email support@pickoffermarket.com. We have used pick offer market since we started our own small web design/development firm over 10 years ago. They helped us get set up quickly so that we could focus on what was most important - growing our client base.