The ability to render scenes in real time, which means you can view them as they are being created. This makes it very useful when working on projects that require frequent updates from clients or other stakeholders. I wish there was some way to export all renders into one file so we could share them easily. Also, sometimes it's difficult to find information about what settings were used while rendering in order to reproduce results similar to those originally seen by others. Sometimes this causes problems because we have to recreate the scene multiple times until we get exactly what we want. We're solving many different problems related to visualization of complex data sets including satellite imagery and medical imaging.