I like the fact that it's open source and easy to use. It's also quite powerful. The documentation could be more detailed and thorough. There are some features that are not explained well enough. For example, there's no good explanation of how to do joins with bitsy. If you're looking for something that will give you the flexibility you need without a lot of complexity, then this might be what you want. We needed something that would allow us to quickly build out our data model and schema, while allowing us to easily change things later.
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