LyndsayGill:
From reading bits from the odd person who has, I get the impression he's a Keegan Hirst type of signing. By that I mean, a bit late to the party age wise, but a big lad who'll do the hard yards and his tackling. Solid if not spectacular,( James Stosic anyone?) but coming into an environment that will get the best out of him.
As a Fev fan, Keegan Hirst isn't a good comparison, Hirst was big, bulky and slow, whereas Williams is tall, not especially bulky but quite fast for a middle (he's scored a couple of tries from around 40m out for Fev this year). Probably someone like Jack Ormondroyd is a better comparison. Williams isn't a wrecking ball but he's a useful player, I'd say he's of comparable ability to Matthieu Cozza who seems to have done ok for you and I doubt Williams will have been expensive.