dont waste your money on cheap but overpriced crap. either get a tefal or phillips we have phillips 9220/20 (was best on Which when purchased last year) https://www.amazon.co.uk/gp/product/B0042EU3A2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I have the harbor 5.5 ltr 1800 watt very good. https://www.amazon.co.uk/HABOR-Family-size-Preservation-Touchscreen-Control-Black/dp/B07C7YMQ3Q/ref=mp_s_a_1_2_sspa?keywords=harbor+air+fryer&qid=1566916229&s=gateway&sprefix=Harbor&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFBOTlHU0tPQkhKS1EmZW5jcnlwdGVkSWQ9QTA5ODc5NDIzT1ZMUTdJQU9ZRzkmZW5jcnlwdGVkQWRJZD1BMDk2NTM5NVlXNDJEVVlFWVNPViZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
We have a Philips XL at Home and a Tefal Fry Delight at the caravan. Wouldn't be without an Air fryer , best thing in our kitchen. The Weight Watchers one should be OK for two people at a stretch. We find if you fill them more than half way up the basket cooking isn't as even. Just cut chips into a bowl , season ( I like to use half a stock cube) and spray on a little oil for best results or no oil at all if you prefer and give a good stir . Take 10 mins at 175 in the Philips or 12 - 15 mins in the Tefal at 190. You can also cook things like fish fingers at the same time. They are very versatile and I've even cooked a small roast joints of Pork and Beef ( making a shallow tray from foil , for the meat) and roast potatoes , same method as chips but as they are lager , give them a couple of minutes in a microwave first.