Closser's a decent prospect who probably wouldn't get too much of a look elsewhere. I may have overhyped him a lot. I think he's the #15 catcher or something on my board. It's just that he has so much more reward than the other pack of catchers. Molina, LaRue, etc...it's a muddled field. They'll all produce about the same, so if Closser fails, you'll probably have some sort of fallback option.
I'm mostly concerned about Closser's PT. There have been plenty of rumors of Johnson trades floating around, but none have occurred. The Rockies seem to be using a lot of young players this year, though. Atkins, Barmes, Holliday, etc.