As far as maintenance goes, assuming you're following reasonable maintenance procedures and intervals, I wouldn't really bother. Modern oils don't need any help. If I didn't have confidence in what I were using, I'd find something else, rather than second guessing the formulators in trying to enhance the product.
If an engine were sludged or I needed a good fuel injector cleaning done by a shop, well, I might consider BG products, certainly ahead of plenty of other competitors. But, regular oil changes and Top Tier fuel, with the occasional splash of a PEA based cleaner, are plenty.