I got it day before yesterday and used it the same night for sweet potato and normal potato fries.
I chopped them up, washed them, dried them, placed them in a bag and sprayed sunflower oil on them, plus a bit of salt and pepper and agitated the bag.
Whilst I prepared them I set the air fryer up and started a preheat.
I placed them into the basket and pressed the 'fries' quick setting and cooked them, shaking the basket when indicated to.
The machine has a fairly loud fan, but this could show that its powerful and has good air circulation I guess. I don't have anything to compare it to, so may be even quieter than some.
They actually turned out closer to oven chips than fried chips, but were quite evenly cooked and the sweet potatoes were better and not soggy at all (like they are sometimes are when done in the oven). They tasted great too, which I guess is what mainly matters.
I think next time I will put them in the bag with a tablespoon full of oil (rather than a spray) and see if they come out more crispy.
The machine itself is a little smaller than what I thought it would be, but still ideal for me and the wife and her daughter (when she stays). If I had a family of 4 I would go for the larger one.
I am going to try Kentucky style chicken today I think.