Other than the lack of PIP support on Android, it's certainly a step up on the web wrapper app approach in terms of performance and not doing funky shit I didn't entirely expect.
The downloading option actually works extremely well and does what it says it does.
Do you know about Findroid? Just in case if you were not aware there is already another app that's not a web wrapper. But having multiple with different approaches is great too, glad to see Streamyfin.