Wagering for these free spins is also lower than usual at just 15x the amount that you win and you are can play through the wagering requirement on another game if you wish unlike free spin offers from Stan James, another Unibet casino. AskGamblers incorrectly have the wagering requirement stated as 30x on this page but I know for sure this is incorrect having taken the bonus myself and confirmed with support today 22/08/2016.
I think I prefer this kind of deal to a regular reload match bonus - although the amount you stand to win from the free spins can vary, so can your losses - or winnings accumulated whilst earning the bonus. Me personally I doubled my deposit just playing through the £100 wager required to get the bonus, then went on to make another £50 with my free spins and doubled the whole lot again whilst completing the 15x wagering! Match bonuses often come with a higher wagering requirement too - at least 10x higher at Maria, and your winnings from the free spins are cashable as well unlike many match bonuses at this casino.