3 suggestions for improvements: (1) the power cord is too short - should be twice as long; (2) would be nice to have a cover for the clear plastic bowl in which the popping is done, to temporarily store the popped popcorn; (3) the top of the retaining nut, which holds the stir rod to the heating base, should be convex, not concave. The concave top of this part catches unpopped kernels, preventing them from falling back onto the heating base, and preventing them from popping.
The time required for popping, and the instructions for the amounts of popcorn & oil to use are very accurate. The unit is easy to clean & maintain.