Oxo hand tools.
Hermin Miller Aerons.
My Olympus skyhawk. Literally the only piece of hardware that's going to outlive me.
The FN P90 and the 57 pistol.
The flight deck on the Sukhoi SU-34 and the Boeing 787.
Basically, anything where the design department went out and asked the customer what their biggest complaints were, then sat down to eliminate them in the design phase.