Hello Jason,
personally, I would NOT use them or recommend the use of any of them. I read an article in one of the classic car magazines, many years ago, that quoted a major oil company spokesman as saying that the company spent millions of pounds in research and development only for the results to be spoilt by the addition of some additive with unknown and unproved qualities!
However, others may have had good experiences with them and advise you otherwise.
Regards, John.