Well, you need to have a decent setup for it to be effective (its actually pretty easy of you have any sort of technical know how). But its a 50/50 thing, some people say its not for beginners, and others say it is.
Strong root growth, quality product if done right
Crop failure, but thats a given with all methods, I just think its easier to screw up with DWC, especially if you have to worry about power outages and such.