I disagree with the statement he's world class. Far too OTT in my opinion. If he was world class he'd be England goalie. I highly doubt he'd even be the top 25 choices for Fabio. Oh aye, and also, if he was world class he wouldn't be at Motherwell... or Everton for that matter.
Good keeper aye, but he's still prone to the odd blonde flapping about moment, and until he sorts that aspect of his game, he'll never be a top top keeper. He has the potential, no doubt, but as Frazza said... if this is him hitting his peak now, he'll never go any further than 1st choice SPL/championship.