OK that does ring a bell. The whole project always seemed a little on the scammy side and I wasn't sure what the browser actually brought to the table that Firefox didn't, so why even check it out?
Much better performance on less powerful hardware (I don't care about synthetic benchmarks, do your own testing and you will notice the difference).
Vertical tabs. Built-in tor support, built-in efficient adblocker that supports ublock origin rules, but is complied into native code.
More anti-tracking and anti-fingerprinting measures (in total, and only counting those enabled out of the box). Configurable shortcuts for absolutely everything. Probably something else I'm forgetting.
Plus a bunch of crypto bullshit, but it's disabled unless you make an effort to enable it.
The controversy came when it was found out they were inserting their own affiliate code into links. That's scummy.