I am a great one for gadgets and have bought many over the years, some of which I regret to say, I used once or never used at all! A few spring (ruefully) to mind:
A soup maker-found it too much faff, a pan and a stick blender is all I need (or a tin and a tin opener…!)
A brownie maker-too small and inconsistent baking.
A large and heavy (and expensive) grill.-too cumbersome, gave it to charity and replaced with a model similar to my previous, much used George Forman one.
A cake pop maker-underwhelming!
An omelette/snack maker-Why? I rarely eat snacks and don’t much like eggs!
So now I am very careful about what I buy. I HAVE bought a smallish air fryer recently but have found it very handy for chips/burgers/snacks when my GC come round. I occasionally used it myself (great toasted hot cross buns!)
My most used gadget? Without doubt my beloved (and twenty four year old) Magimix food processor. I use it very often, even more than my longed for KitchenAid mixer (which is only used occasionally for large bakes-not often as I live alone) I sometimes think it approaches ‘white elephant’status but was too expensive (and is too beautiful!) to let go!