Everyone is getting bent out of shape. Just use whatever app you like best. I have 5 apps installed that I'm testing including Sync.
That being said, my 2 cents regarding Sync: I don't mind paying for a great app like Sync, but I'm not crazy about subscription models. I know there is a one time option but $100 for a mobile app is beyond nuts.
EDIT: $100 is for the lifetime "ultra" plan. It's $20 to remove ads.