ArcGIS Excalibur enable you to search for, discover, and work with imagery in fully integrated workflows for image analytics and exploitation. With this tool you can publish hosted imagery. Review collected by and hosted on G2.com.

Well, there is nothing which I say as dislike, but once I had an issue with image rendering, it was resolved via the FAQ section, which is briefly described. You can refer to it from the link: https://doc.arcgis.com/en/excalibur/latest/reference/faqs.htm#anchor11

And another thing which can be workable is that this tool should support customisation through API. Review collected by and hosted on G2.com.