It is saving me months of work in a complex product, letting me iterate and adapt designs. I'm focused on iOS at present but the Kotlin generation looks good enough I'll be using it soon!
I excitedly jumped in Supernova about a monthy or two ago, and really like the core concept. Except the React Native exports just were not up to scratch. They were really unusable. To top it off, I couldn't cancel my subscription. Everytime I attempted too, I'd get a little notification telling me "This feature will come next week." This happened for 2 weeks straight. I finally emailed them to cancel my subscription, they responded quickly and asked why I was cancelling. I gave them pretty good feedback, but never got an email back. I'm unsure how Supernova has matured over the last month, but I hope it's living up to expectations :)