It's very good and I am sure it will only improve over time. Also, prompt writing has also improved, and continues to get better which gives better results.
I use this new feature almost daily to create my designs and I love the fact that there are always new features and that the team is very attentive to our ideas.
CF spark is a game changer in terms of accessing easy to use tools for designers. It provides really awesome high resolution artwork and is affordable. No hidden fees and no complicated software to learn. It really is a great community and everyone is ready to help each which is awesome.