Jack Moore likes the Sean Marshall extension:

Particularly as a left-handed pitcher in front of Great American Ballpark’s incredibly short porch (having sat in the front row in left field, it’s even shorter than it appears on TV), it is likely too much to expect that he allows just one or two home runs per season as a Red. As such, he won’t be the single best relief pitcher in the league with Cincinnati, but that’s not what the Reds are paying for. He has the ability to be a very effective setup man who can move into the closing role should Ryan Madson depart after the season, and at a cost of just $5 million per season, the Reds are getting a fine deal on that skill set.

I do worry a bit that Marshall’s heavy workload the last two seasons may burn him out eventually. He’s not quite Rob Murphy in terms of innings, but he is going to pitch for Dusty Baker, who won’t be afraid to stretch out Sean.