1. No need to fiddle with getting the heat right to get to pressure, and then lower the heat. Just seal the lid and tell it to get to pressure. It will control the heating.

2. Timer. It will drop the heat once the timer runs out. A lot of people set something to cook for, say, 30 minutes. Then they go out of the house for an errand that takes over an hour. They don't need to worry about overcooking/explosions. It will turn the heat down after 30 minutes and keep the food warm.

That's really about it. I own both a stovetop one and an instant pot. Most of the raves I've seen for the instant pot apply equally well to other pressure cookers. Having said that, the two pros above are really, really nice. If people can afford it, I would tell them to buy this instead of a regular pressure cooker.