I have a GE combination convection oven/microwave and it was clearly designed by someone who had their first experience with LSD that day. Every function requires a different, magic, set of key combinations to make it work. Want to set a timer? That's easy, press timer, turn the dial to the right time (which inexplicably increases/decreases the time in 30 second increments). OK, you've done that, now you want to start it. Press "Timer" ... nope. Press "Start" ... nope. Oh, I have to push in the dial... I didn't even know that, too, was a button. Oh, and not once, not twice, but three times is the magic number of times required to start said timer.
Starting the microwave with a specific time in mind requires hitting no less than 6 buttons, but there's one button that will start the microwave on high for 30 seconds, so everyone just uses that button and hits it as many times as is required to get close to the desired cooking length. I can hear my wife counting out loud ten beeps for a 5 minute cook time.
It's got piles of advanced, useless, features, my favorite of which is a hybrid "microwave/oven cook" mode that manages to bring in the worst of both methods, giving you soggy food, unevenly cooked that takes an eternity to cook.
Even the clock is stupid. You punch in the hours/minutes, and thinking you're done, you move on to something else. Later you go to cook something and for some bizarre reason, "AM or PM" pops up on the screen at which point nothing in your previous experience in operating a microwave prepares you to figure out why heating something up requires knowledge of whether it's morning or afternoon. Of course, nothing this microwave does requires knowledge of AM/PM, nor does it display AM or PM anywhere on the screen, but for some reason it just must know.
[0] This isn't the exact model but it looks close: https://www.amazon.com/GE-PVM9179SFSS-Profile-Stainless-Micr...