The simplicity of developing business process flows using BPEL language is one of its best feature. It's easy to integrate with other applications like Salesforce, SAP etc. Also it comes along with a variety of connectors and APIs that makes it very flexible to use. It can be used for designing flows as well as code implementation. The UI can look a bit outdated but I believe this is due to lack of resources from the vendor. We are solving our business problems by automating manual processes. And Blue Prism has helped us do so.