It is on the Insider part of ESPN, so I can't link it, but here is a quick summary of what Keith Law says about the trade.
Hamilton will be a stud, but he may not be durable. Even if he only plays 3/4 of the season, he is far more valuable than Volquez, who Law sees as a #4 starter at best, and could be a complete flop at worst. He did add that he could end up as a good reliever if all else fails.
KEITH LAW IS ALWAYS WRONG!!!!! So this is very good news for the Reds. If he had liked the deal, I would have been worried.
His main argument against Volquez is that he does not have a good third pitch, so he can't be a good starter. That is complete nonsense. Steve Carlton, Nolan Ryan, Tom Glavine, Mario Soto, and too many to mention great pitchers were two pitch starters.
Not saying that Volquez will be great, just that his lack of a third pitch is not what will hold him back.