It's LARGE capacity and sensible layout means you can cook a variety of things.
Its mobile, so you can pack it away easily, and its easy to clean - assemble and put away - saves space too.
It's pretty well built, and with care will last many many years.
It's faster than a conventional fan oven and cooks PROPERLY - cuts down the cooking time and is especially useful when you're using it in ADDITION to your normal oven, ie. when you have guests and a lot to cook, a dinner party or something.
It has a timer, you can see your food cook, and bakes as well as roasts!
What can I say? Some people may be a bit reluctant to go for such an oven, or may dismiss the idea as a gimmick.
But this would be grossly unfair, as trust me, this thing does EXACTLY what it says on the box, with minimum fuss - and costs wise, I'm sure it'll be using less energy as it's halogen based, and besides, it's a fraction of the cost of an Oven!