Avast Safezone Browser: Good / Really Safe?

Has anyone tried avast SafeZone Browser? Anyone use it as their default browser?
Is it bad ... mediocre ... good ... great ... freakin' awesome? Is it slow ... average ... fast?

I was just barely Googling up info on it. I found articles on Softpedia and PCWorld that mention that some Google Researcher found a serious security flaw in SafeZone Browser. However, these articles are from way back in February 2016. Anyone know if avast has already repaired this alleged monumental security flaw?

FYI --- For a long time now, I have not been able to log in into the avast forums. I believe because of my Dial Up. So I cannot make any of these inquiries over there or comment or anything.