In terms of the contract I am only a little worried about his size because you never know how these things play out over the years. These smallish, fast, puck-moving defensemen are a somewhat new commodity in the NHL. I definitely would have made the deal. Don't get me wrong. But I think there is sort of a gamble based upon one season. I mean, Mike Green.
When it comes to maturity I have no doubts about Karlsson. Isn't he getting married this summer? You could easily argue he's too young to get married, but it goes to show to that he's serious about being an adult. He's from the Aflie school of appreciating how lucky he is.