Even with him platooning, I figure he'll hit 15ish homers for us. That would be pretty impressive, given he's never topped 9 in a season (and his next highest total is 6).
Why? Seeing the Uptons right now hurts like watching Cespedes. Who would we have traded for Justin? No idea, but I really wouldn't have had a problem with whatever package they put together so long as it didn't include Castro or Rizzo. It still hurts.