Good app maker. There are many templates readymade. I have tier 4 since e-commerce feature is a big plus. Monetization option is great to get paid from ads for your hard work. Sime things to keep in mind:
The source code won’t be available, so if you plan to use it for your customers then you will have to think of a strategy to address this if a customer asks for it. The team (shared account) feature is not available yet, but the developers have shown interest to include it in their roadmap.