I decided to play this through on one of my favourite Playtech slots "Great Blue" which is a super high variance game but one that can really give you a bad day if you don't get lucky quickly. The scatters are extremely hard to hit in this game and even when you do get them you often end up with a bunch of spins with a low multiplier rather than the 23 spins at 10x you are hoping for. I was lucky this time though and scored hit after hit, eventually betting at £1 per spin which gave me my biggest free spins round returning just shy of £800.
As a long time member of Sky's other sites Sky Vegas and Sky Poker I had no trouble receiving my winnings quickly, though Sky operate an electronic verification policy anyway and if they are unable to confirm your identity then they will request your documents from you before they allow you to start playing. A couple of people don't like this but I think it's by far the most sensible way to arrange the verification procedure.
If you are also a member of Sky's other sites but have not tried their playtech casino yet there really is little reason not to chuck a tenner into this part of the site to try your luck with this bonus. Despite the 50x wagering requirement it's a sweet offer for a risk of just £10 and I definitely recommend it.