Unless I'm cooking for a large group (for example, an office party) at which time I'll use an inexpensive American brand, Kewpie is the only mayonnaise that lives in Casa Minx. It's a perfect sandwich spread on its own, but the addition of a few other simple ingredients can transform it into a delicious sauce, salad dressing, or dip. I like to mix a couple squirts of mayo with some gochujang (Korean bean paste) and a bit of Sriracha for a perfect hamburger spread. Of course it also works well with chicken or tuna salad, and makes very flavorful egg salad and deviled eggs.
The biggest problem with Kewpie mayo seems to be its availability. Giant Food near me carried it for a brief time, as did Asia Foods on York Road. Wegman's has a large International foods section but no Kewpie. We usually have to make a field trip to H Mart and then we buy several bottles at a time. If you don't have an Asian grocery store near you, Kewpie mayo is available at Amazon.com.