I use mine a lot. I’ve cooked fish, pork steak, chicken breast, fries in it. I’ve reheated things such as pizza, French sticks, scones in it.
It saves putting the oven on for smaller quantities.
As regards cleaning, its simplicity itself. The drawers and shelves remove for washing and the cavity is easily wiped round once the element has cooled - much easier to deal with than a standard oven in that respect.
In terms of cooking time, I don’t find it massively quicker to cook the food but no pre heating is required in my model, so that, in itself, saves electricity usage. Trial and error regarding cooking times, I think, as I suppose different models cook at different rates, rather like different model ovens do.
Like you, I debated for a long time whether to bother or not, but I can honestly say I’m glad that I did.