Def check out Boost. I've used both and can't find anything in sync to warrant the coat vs. Boost. That said, Boost is worth the cost for sure, and if Boost wasn't an option, I'd consider sync.
Plenty of features. Last time I checked, it was on par, or better, with sync. As ad-supported freeware, sync just bas too many ads, which on my phone turns into endless black squares of blocked content.
You van support Connect with the usual buy-me-coffee thingy.