Is this offer worth completing? Let´s take a look at the key info and work out the EV.
Min deposit - £10, min withdrawal £10.
Wager the deposit on £1 blackjack (EV -£0.12)
Guns N Roses minimum spin amount is £0.20 so 30 x £0.20 = £6 worth of free spins.
If we win £5 from the free spins, with x45 wagering (which is is higher than other similar offers), and we wager on low stake medium variance slots, we have a 9% change of completing with an EV of +£3.42.
Overall the offer does have a +EV, so over the long term by completing these offers we should come out with a profit. Please make sure you fully understand how EV works, as this does not mean you will make a profit from this offer.