It's also currently stacked on top of ext4, and the tree data has to sit on some other filesystem as well. So promising design, but quite a long way from ready for production.

Not only that, but they need some fun patches...

> Our design minimizes changes to the kernel. The current code requires a few kernel patches, such as enabling direct I/O from one file system to another. We expect to eliminate most of these patches in future versions.

I prefer half-baked projects that are honest about their status over overpromised vaporware, personally