The innovation here is that the module displays overlays debug info in the front end that tells you what to name the image so that it will work on that particular page. This makes it easy to match images to particular pages. There is an option for a default image.
The header images must be all be the same size as the size is specified within the module. There is support for multiple modules that I have not tried.
I have not tried the advanced features include DIVs and Joomfish support. VM support requires a license for ShopHeader but there is no info or price for this option. The developer website has good docs for FlexHeader2 which looks very similar to the beta I installed.
Flexheader3 now includes the VirtueMart Support for free.