Sync is fine. More good apps are better for the platform and really needed.
I personally will probably not use Sync for long. I remember using it for Reddit for a while but noticing the app was updated to slow which over time broke some stuff. Then I went onto the Sync sub and apparently the dev is a bit...sensitive when there's negative community feedback and then just stops for a year or longer or so. Good on him if he can of course, it's not like he has to cope with the internet but I've found other apps to be more reliable overall for Reddit. Let's see how this one goes.
No catch? Especially with Oracle? Hard to believe kinda, nothing is ever "free".