I've been playing this each day over the last few weeks. It's free and you win free spins / bonuses on selected games or cash rewards etc. So far won about £20, including £13 the other day - worth 1 minute of your day.
A trend I've noticed is that you seem to win one day and the next day you don't. Any one else noticed this? Anyone had any luck with other free games on similar betting sites.
Make sure you withdraw as soon as you reach a fiver!!