This is a great price, considering that exactly the same thing is going at BT Shop for £78.28! They quite often go on eBay for the same amount.
I'd rather have brand new with the option of returning to be honest.
Powerline adapters are the ideal way of creating a home network or complementing an existing Wi-Fi connection. By providing a secure high speed connection and great service quality, Powerlines allow you to watch Standard and High Definition (HD) movies as well as play online games without interruption or pixilation; share photos, music and other media stored on a PC or compatible storage device anywhere in your home. Powerline Adapters will help you reach those areas of your home where Wi-Fi signal is either too weak or cannot reach. Other usages of Powerline adapters include IP-CCtv surveillance cameras, setting up an office network without the need to add more wires or rewire if you change your office configuration.