I managed to make a few cool environments before it went to subscription.
The subscription is not worth it for now. $240 a year (pro license) is too expensive, for what is essentially an experimental software, fun but rather useless.
There are too many issues:
1. Skybox AI cannot generate high dynamic range images, it's basic 8 bit jpeg.
2. It doesn't output high resolution images. 6144 x 3072 pixels is not enough for modern production. For 4K productions the environment should be at least 200% larger (ideally 16K).
3. There are not enough editing tools, especially for controlling the depth of the scene. A good environment map should have only distant structures, the center of the 360° world should remain empty. This cannot be controlled easily with Skybox AI. I would also enjoy tools to edit the illumination and the textures.
4. The results are decent, but not exceptional. Skybox AI handles fantasy pretty well, but struggles at realism. Another issue is that the content is censored/limited. Skybox AI expects you to do meaningless fairy tale or sci-fi worlds. If you're too specific, it'll ignore the input text.
4. I would like to be able to import reference images.