So, it's not all sunshine and flowers. It sounds like your calibration process was successful, but when its not, you end up with a range of problems, including

So, it's not all sunshine and flowers. It sounds like your calibration process was successful, but when its not, you end up with a range of problems, including the ever-fun one of 'my stomach has been pumped full of air overnight and I feel like a balloon ready to burst' - every single morning.