I bought a pair of Dukes last year, mounted them on a pair of K2 Coombas, and they've been one of my favorite pieces of gear ever since. This AT binding should be bought for the alpine mode. I feel completely confidant and secure in the Dukes and their ability to handle hard-charging in a resort and in the backcountry. The only time they've released on me has been during unfortunate run-ins with trees. The touring mode works perfectly fine. The two climbing positions have gotten me up a variety of pitches comfortably. Yes, the bindings are heavier than other AT bindings and, yes, you have to step out to switch between alpine and touring mode, but those are a small price to pay for all the advantages the Duke has.
This is a binding for young, aggressive skiers. It's expensive and heavy so clearly many will prefer other AT bindings. But, for hard charging skiers interested in the backcountry, as opposed to backcountry skiers, the Duke is an awesome binding.