Just downloaded and holy crap, this thing is smooth as butter. Already more functional than that $115 closed-source alternative. Instant switch for me.
The Sync dev is currently charging $20 USD to remove ads, or $100 for a lifetime subscription to "Ultra" which includes some additional features. I have to say, the app is really nice, but the dev is out of his mind.
With that being said, it's not FREE to use if I'm getting ads, I'm just paying with something other than money. I'll continue to use one of the many alternatives.