Looks like an even trade to me. Darvish is an outstanding SP - Better than Niese and Ryu. Posey and Braun are All-Stars. Mauer is having an off year so far but will hit .300 and is still eligible at Catcher. I like the Darvish side but not by much. Basically - Two good players for four. Blackmon is a nobody. Niese and Ryu are not bad SPs.