Performance is good, it doesn't struggle with punctuation like other models sometimes do. Its also easy to use for someone who doesn't use text to speech often. You don't really need help setting it up. It integrates well with other Google products, which I use often, so it's a good solution for me.
AI in Nano Banana helps me create images and choose from many different styles, so I can better match the look of my blog and the topics I manage. Also, with Genimi, you have all the support you need just by asking, and it is free to use (the basic version), but you can do a lot!