Its going to be really nice to have someone who can slide up and play center as a depth player. And if his post-surgery trend this year proves to be sustainable its going to be a very favorable contract. But if the team is trying to part with Lehtera, has Stastny going to the end of his contract and possibly trying to attract UFA centers, having Berglund is an important point for stability.
I felt last season when he first came back from injury that you could see immediately how much he brought to the team with his puck possession and size, even when he wasn't scoring. I like the contract, and think the team went longer on term (5 years vs 3 years) to keep the AAV so low. He could have gotten more if he'd wanted to go to the UFA market.
Its nice to sign players who want to be in St Louis. Its hard not to like a guy for that.