I have dynastars and fristches diamirs (sp?). My dynastars are rebranded naxos and the work fine. I like the heel more than the diamirs. Sometimes the diamirs heel locking feature will adjust height positions when im climbing and thats never happened with the naxos.
Dynastar doesn't make AT stuff so I am assuming that you mean Dynafit?
This year I went all out and bought Dynafit Radical bindings and the Titan Ultralight boots. I have not skied them yet so I can't give you firsthand stuff though.
Go search the TGR forums...there are HEAPS of threads, reviews, questions, and comments on ALL things Dynafit (and tech binding-related, for that matter). Wild Snow also has a lot of 'more formalised' information.
Plum Guides seem really bomber too, although they are more difficult to get because they lack consistent North American distribution. I would have tried harder to purchase them but I found Radicals at a good price first.
I was unaware that Naxo binders were Dynastar. Thanks for clarifying that for me. I don't have any experience with them, although they look similar to Fritschis, which I do have a lot of experience with. They were not very durable. I can say more about them if somebody wants my opinion, but I won't give it in this thread otherwise.