I'm a 3rd generation Havoline user and it's my go to oil. I've never had any oil related problems nor have I experienced any sludging or abnormal oil usage in automotive or OPE applications.
I also remember both my grandfathers and most of my uncles saying nothing but good things about Havoline motor oils.
Hence, when I see it on sale, I tend to stock up on it! Also, the UOAs I have obtained have always shown Havoline to be a robust oil.