I have been using b4a for over 4 years now. It has greatly increased my development to get our products to production much quicker. The free tier is perfect for development and testing. I've had no issues and they provide great features, including Live Query (websockets), cloud code, easily create tables, manage permissions in detail for each table, and view logs quickly. Tech support is quick to respond and always have a quick fix. Highly recommend if you want to get your product up and going quickly. I am an experienced developer and have no problem working in SQL and NoSQL dbs, but this is the way to go for fast, reliable development.
I'm sorry i'm gonna have to update my review, because this went from the most amazing thing I've ever seen to it can't do a damn thing without making a mistake in a matter of just a few hours. I don't Know what changed But I went from highly impressed at pulling my hair out since this morning.