I'm a huge Runyan fan, glad someones taking a chance with him. I loved watching him get out on a run plays and level fools.
He was a solid pass blocker and a great run blocker, but I don't know what you're going to get from him now, he's taken a beating over the years. I do know he'll give everything he's got and play through any injury.
I'd say his dirty player rap is justified but it isn't a bad thing. He isn't going to cause stupid penalties or anything like that. You'll probably appreciate his nastiness if he gets a chance to show it.