We just got a Ninja and did a roast beef last night and it turned out excellent. We went with the dual zone that has a large cooking section or can divided into 2 sections to cook 2 different items at once. So far we're really happy with it.
MB picked up one at a Pampered Chef Party a couple of years ago and I like it not only for french fries but it makes great chicken wings ! ... Only problem I have is digging it out of a corner on the kitchen counter so we don't use it all the time...great for reheating fish and chips !!!
I'm sure if you go to any house there is probably a pile of cupboard queen appliances that have been used once or twice never to see daylight again. I like my cast iron fry pans and stainless pots.