He's alright but not a world beater. I'd say that he's better than some of the props that you have at the moment and should definitely be in your line-up.
He has some games where he shows up well and makes some great drives going forwards. However, he has other games where he can go a bit anonymous.
The biggest issue he has is his injuries - he missed several games this year for FC and his record at Wigan wasn't brilliant either. If he can keep himself fit and get a good run of games then you should see some good things from him.
I hope he does well with you - he gave plenty of effort in his performances with Hull and seemed like a good guy in general.