From the features list this is basically Opera.
From the "About" page on the site, they're basically the Opera developers who still wanted to make what Opera had been intended to be.
safari has always been garbage
But it's pretty fast garbage.
And I get like an extra hour of battery life when I use it.
For me, I use it due to being on multiple Apple devices, so just having a unified bookmark and history, as well as Hand-Off makes it attractive. Previously it was the only browser which ran worth a damn on my 7-year-old MacBook Air.