When I got married, I was stoked to open all of our gifts, and soon realized most of them were dish towels or some shit I could care less about. About 2 thirds of the way through opening, a ray of sun shone through the apartment window and I tore the paper open on what I thought to be another useless household item. But no, this was different. A panini press appeared before my eyes, and the wheels started to turn. "I think this might actually be useful." Fast forward a little over 5 years forward and I use that shit almost daily. My normal sandwiches have turned into a toasted sandwich with melted cheese, adorned with a crispy outside layer. My quesadillas have matured into beautiful creations that I never could have imagined.
With that said, I just had a sandwich, which is my staple at lunch, with some turkey, salami, bacon, lettuce, mayo and mustard with a tiny amount of butter spread on the sourdough toast, and it's still the best thing ever, despite making it several times a week for years.
So basically, if you're single, buy a panini press, and if you're getting married, make sure to register for that shit. It's a game changer.