The one thing Adley has proven lately is that he has been injured. If he can get over that, the trade can be worthwhile. If he continues to hang out in the trainer's room over the next 1.5 years, it's not worth it.
With this trade, the Sox are paying a premium for a name. He's a good clubhouse guy. Great to have in your org. Someone you'd put a C on the jersey. He just needs to stay healthy and he hasn't recently.