I was very excited when it came out. Google have Imagen 3 (is that the same as Gemini Flash?), but you need special access to be able to edit images. I haven't tested it yet but I think it's a lot cheaper than OpenAI
Also, I request you to expand further, why Gemini is not better?
site is not really ready for this, but if you want to get an idea go here https://d2uua1ig5ocnwt.cloudfront.net/ and search these:
amber ladybugs north
I manually remove failed gens, but the proces doens't scale to where I'd like if I have to manually verify images. and I have to have a few automatic rejection in the pipeline, like top border not white or image not squared.