This browser, aside lack of proper sync, is awesome! Its fast and fresh, not to mention being open source!
However, I found two things to be very annoying:
URL Bar is too short and tiny, comparing to other browsers. Im not talking about width, but height and font size. Same can be said about tabs. This makes is way harder to use and disrupts focus.
AdBlocker does remove ads, but it also leaves empty gray boxes on their place that are ugly and distracting. This never happened with uBlock Origin.