Get one! They are brilliant.
My electrician told me the reason that some have ‘fried’ is because of the way they have been wired, basically wired into a circuit that doesn’t allow for the extra power used when using the cleaning function.
The door purposely doesn’t allow you to open it until it has cooled down to a safe temperature. It gets very HOT! I’d say this is an excellent feature and would never see it as a problem.
If there are bits on the glass, I give a quick clean with some Astonish oven cleaner from the pound shop. A tub lasts forever, and takes less than a minute!
Then power on and away you go. It may ‘smell’ a little but not horrific, and not every time. Maybe if you have been cooking something extra ‘spitty’/fatty, like duck, it would vary to the extent of the cleaning smell.
At the end there may be a little bit of white residue which, when oven has cooled down, you just wipe away
I have Neff ovens, so I just take out the shelves and unclip the side shelf holders before switching on the clean function. I clean the shelves separately, again depending on how often you clean them and what you’ve been cooking, the easier it is to finish the job.
I wouldn’t want to be without them now.