Is 8.5 quarts too big for one or two people?

It is larger than most households need for daily small meals. It makes sense if you cook for four or more, batch-cook, or want room for a whole chicken.

Does the viewing window mean I don't have to open the basket?

The window and light let you check browning without pulling the basket out. You still need to shake or turn food for even results, especially with full loads.

What can I cook at 400°F?

Fries, wings, vegetables and frozen snacks crisp well at 400°F. Lower the heat for delicate items or anything with a sugar-based glaze that can burn.

How does it compare with a 5- to 6-quart air fryer?

It holds roughly half again to twice as much food, so bigger batches cook in one round. In return it takes up more counter space and can brown less evenly in large loads.

Do I need to preheat it?

A short preheat of a few minutes helps crispness, especially for frozen foods. For dense vegetables or meats, starting cold is fine.

What should I check before buying?

Measure your counter space and check the basket is dishwasher-safe if you want easy cleanup. Confirm the controls and presets match how you like to cook.