I have installed and tested the EPiServer.Marketing.Testing Add in:
EPiServer version 10.10.4
EPiServer.Marketing.Testing version 2.4.4
My experience is that this is far from production ready, is this the gerneral opinion here? Poor documentation and very buggy.
As you can see, this module is so broken it cannot possibly be ready for a production environment - it does not work. Perhaps the latest version + EPiServer 11 improves things. I think the 2.4.* QA team should hang their head in shame.
Questions re latest version + EPiServer 11
Sorry to hear you are having such trouble with the package. I would suggest creating a support case for the issues you are running into so they can be reproduced and worked on by the dev team. Obviously, if the problems you are running into had presented itself during the QA process the package would have been held up and not released so finding what is hindering the funtionality for you is essential to fixing it.
As for your questions:
I agree regarding point with thumbnails - load takes a huge amount of time, it's useless for blocks and doesn't render CSS styles well (phantomjs limitations)
Don't you have an option to disable it?