Flows take setup time. The M9s are a good binding and will match up with the DH2 well. But take the time to get them dialed. For the same reason they can be more comfortable than a traditional two strap binding, they can also "feel" less locked in. Because you don't have to crank down the strap like a two strap, you don't feel the strap as much. It hold just as well despite the "looser" feel.
Just prepare to spend the first day on them tweaking them after every couple runs. Not a huge deal, especially since their micro adjusts are leaps better than they used to be. The payoff for you hard work: speed entry and a binding that feels exactly the same every time you strap in.