header collector flanges

What do you think of ball flange connector for headers to exhaust connection... I now have the 3 bolt flange and it has always leaked they are thin and not the welded type... I need to address this problem it given me trouble sense the beginning... either reflange with a 3/8" or 1/2" flange and welded or use the ball flange or v flange what are your experience

I used them on my car and love it.no leaks or gaskets to deal with. I think they were called "header buddies".lol