From what I remember, ZiPS has liked him for the past couple years, and now that he's getting playing time, and is in Colorado, it seems like a perfect storm. I'd definitely give him a shot. They'll probably paly him over Helton quite a bit as long as he's palying well, and of course he can play the outfield once Carlos Gonzalez gets injured.
The power is real. I am a Cubs fan, so I saw a lot of him during his first few seasons. The problem has always been his ability to make contact and patience at the plate. Unlike a Dunn, he won't walk much and refuses to take a more balance approach at the plate. However, he's batting .300+ right now, so maybe something has clicked since going to Colo. I still remember that when he first came up with the Cubs, he strike me more as a Brett Jackson type of player. Some speed, good bat, but just can't make consistent contacts and lack of plate discipline.
I picked him up a little before the ASB. Hoping that he'll continue to pound the ball in Coors!
Unlike the Cubs, the Rockies don't have anyone blocking him. They're also unlikely to trade for anyone this year, so I don't see any reason he can't get most of the remaining starts at RF there. He could even sneak into a regular cleanup spot until Tulo comes back unless Cuddyer gets his groove back.
You have to worry about his lack of discipline catching up to him, though. High K rate with low-and-declining BB rate means a correction might be coming. Or it might not. Ride him out!
Isn't Colvin just Viciedo in disguise? Power and tons of K in a nice ball park environment with hot and cold streaks written all over them. Opposite split between righties and lefties. One is build like a tank, while the one is like a walking piece of sticks. Other than that, they're pretty much the same player!