Personally, I'd steer clear.
Wanadoo's LiveBox only works with their service, so if you change ISPs it's completely useless. Not only that, it's not actually as good as other products on the market. And probably more expensive.
Wanadoo also charge £17.99 for a mediocre service with a 2Gb cap. A very large majority of ISPs can offer you a much better deal. F2S offer 5Gb for £14.99, for example.