Hi , I took a quick look at it.
The only thing that really attracted me to stingray is only the workflow, as what i have heard so far about the beast lighting system is not as good as lightmass.
But after playing around with it for a while, i think the ‘pros’ in the workflow does not really outweigh the many amazing things in unreal. Sure you can update your assets real time, but exporting and importing assets using TS_tools scripts isn’t really that difficult either. 