Wolves fan here, great bit of business for Blades. Gibbs-White struggled to get game time under Nuno as he usually played a flat midfield two in the centre of the park which never suited GW. Basically GW can't tackle and goes awol when having to cover, however is good breaking forward with the ball at his feet and likes to get into the box. He's an ideal number 10 behind a central striker so if Slav can work around that then he'll do very well. Swansea played him in that role last season for a month or so before he got injured and he did very well there, as has our new manager Bruno Lage in pre-season games, where again he has been playing better than ever.
On the plus side, he is very mobile, good at fancy flicks and will bring a lot of energy to your midfield. On the downside, he lacks composure in front of goal at times and his pass completion is a bit ropey. A bit like marmite, probably around 50% of Wolves fans currently think that he should be in the first team and the other 50% probably think he will never make it. Regardless of his abilities in the Premier, he will be a top class player in the Championship if you give him the ball and will certainly improve your current line-up. Miles better than Lee Evans. Good luck with him.