Energy Saving

Pressure cookers are very energy efficient. Cuts the cooking time by two thirds and apart from when you are bringing it to pressure, it only uses the minimum heat level. Most legumes cook in under 10 minutes and you can get perfect basmati rice in 3 minutes and a 10 minute rest.

I use my pressure cooker for soups, beans, and lots of other things,   even bought a small one to take camping.   

I don't use it for  green veg unless its for soups I find its its easy  end up with mushy veg.

The only disaster I've had was the safety valve blew firing peas all over the kitchen, luckily our kitchen celling is low enough for me to touch so it didn't take to long to scrap of the peas.   So now when i cook mushy peas  they go in slow cooker.

Yeah some things can be dangerous when pressure cooked. Here's a quote from the manual for our pressure cooker:

'This cooker is not suitable for the preparation of apple compote, cranberries, porridge (oat flakes), barley or other cereals (except those listed in section 16), peas, pasta, macaroni or rhubarb. These foods tend to foam and froth and could block the valve. These foods should not be cooked in a pressure cooker.'

You actually can pressure cook some of the above but it requires extra steps, for example oats have to be done in a bowl inside the pressure cooker and not directly in the pan.