Well,
It surprised me quite a bit, it got me to the early days of using KT and later Thea, and I am amazed at what a great product this is.
This time around I do have a somewhat better computer but still it is quite fast in rendering with GPU (GI)
It does take some time to get going, especially if you used VRay, but it has a great web page with enough information to make it a painless tryout.
What I miss is the stop/start button for rendering, and I did not like that the rendering settings are not saved, so every time I start Rayscaper it needs to be repeated.
There are more things I would like to address, but those two would make me buy it, especially since I quit using Vray two years ago. For anyone who is looking for a standalone renderer, I do recommend Rayscaper since I think it will only get better with time.
I started with a small, simple scene, floor, wall, and comfy chair.
Used HDRI and three directional lights.
Picture is 1000x1000 px, GPU (GI), 1000 s/px, 1:10 min. RTX 4080 Super.
I do tend to continue my tryout with more complex scenes when I have more time on my hands.