Well, you should ask to people really using it.

I have read some advices from Machinery_Franck that said, that
some things are broken like portals, culling, lot of bugs remain etc ...

They are making updates, they plan to clean it and fixes bugs existing from years ! But will it be done ????

For price of 99$ indeed it remains a really nice package with
World/terrain/vegetation/shaders editor all in one !