I have owned one of these for a couple of months and have not regretted it for a moment. I do not like deep fat fryers so have previously relied on oven chips or baked my own chips in the oven, until this great item came along.
The chips really do taste like they have been deep fried and take about 40 minutes to cook. The quantity you can produce is reasonable for two people, probably three, and you do only need a spoonful of oil to do so.
It is really easy to use and wash up (the tray lifts out and the lid is removable). It comes with a recipe book that indicates you can cook lots of other things in it, such as chicken, but even if you only make chips I'd say it is a good buy.
Other than the size, which seems a little on the bulky side, the only other drawback is that the noise of the timer is drowned out by the noise of the machine when it is working. The machine is not noisy overall; you do have the sound of the air circulating around the food but I would say it is no more noisy than the sound made by my fan oven in operation. The 'problem' is that the timer is just too quiet to be heard unless you are standing right by the machine and the actifry stays running and cooking the food until you switch it off. I have overcome this by using my oven timer to alert me when the food is ready but I think it is a small design fault (I sent one actifry back as I thought the timer was so quiet it was faulty, but the replacement is exactly the same).
Best bits: the food produced and it is easy to use and clean.
Not so good: timer seems redundant and it is a bit bulky.
See my comment below about the longevity of the design.