It's a great tool, but I've had a couple of problems - quite possibly because I'm a newbie:
First, a point jpf55 raised is an irritant for me too: repeated messages to my phone telling me that the target temperature has been reached and it is ready to start cooking - long after cooking has actually started.
I think, but am not certain, that this occurs whenever the temperature drops below its target by a tenth of a degree, and then returns to the target level.
Second: Having started my first cook, I sat back in the living room to browse through other recipes in the app - only to find that the app changed the settings on the cooker to match each recipe I looked at!
Is there a way to tell the cooker to not change its settings unless the cook specifically authorizes it?