It's not the best solution I have used, but also, it's not the worst either. It is an average solution, and I know it is on the cheaper side of the spectrum which is why my company chose it. They always choose the lowest cost provider. Certify also does not have any integration to the travel solution we use, so everything in that has to be manually uploaded.
I believe for a large organization Certify is the least costly provider compared to other solutions. It is significantly better than using the likes of SAP's Concur ERP type platform. However, it is not as forward-thinking and cool to use like Expensify or Zoho. Again, you get what you pay for!
In a smaller organization setting, or for people that are NOT road warriors like myself that have multiple receipts each day, it would probably be better suited. When you have many many receipts to document each month, going through each to ensure accuracy takes quite a long time and is burdensome.