The seats are usable in the right scenarios. I have used 3rd row on my F15 for over 5 years. Kids love them and will choose to use them over the middle row given a choice. There have been multiple trips when we have taken the kids friends (around 5 ft) on day trips that wouldn't have been possible otherwise. We have also been able to car share with friends when otherwise 2 cars would have been required.

When you consider the target audience, for £1400 the 3rd row is a steal.