Just decided to purchase one of these for myself as I was paying £15 pm for a o2 simplicity contract, this works out cheaper and you get a nice phone. Contract is only 12 months too. £150 has to be claimed back via redemption and £30 can be claimed by going through the quidco site. I just had to edit this as when I ordered they offered £195 redemption which had worked out at £11.25 a month, anyway £15 a month for 12 month contract still seems good.
Nokia 5800, T-Mobile, 300mins talk & 200 text, x-network, 12 month contract, 15 per month @ Phones4U (after quidco)