yeah, AT bindings.
I guess Ill write a brief little thing on them....
Fritschi Freeride and Freeride Plus
This binding has been the standard for years. Pretty durable, skis pretty well, tours pretty well. It has 4 heel heights, which is nice. Pivot point is at the tip of the toe. DIn to 12.
Some people have insta-tele problems with this binding (I have had them and thus got rid of them), some dont. it usually depends on the ski being used (softer skis flex a lot which pops of the lock down.
The New FR + has two major improvments. They changed the design slightly of the lockdown so it shouldn't insta tele anymore. They also added a kind of rail system so the binding is more laterally stable.
These bindings are a good option and get the job done.
Naxo Nx21 and Nx01
IMO - the best touring binding(that can be used with normal alpine boots) is the Naxo Nx21. I skied the FR for a year, and switch over to the Nx21 this year.
I love this binding. It has a lock on the back so insta-tele is impossible. Din to 13. I think this binding both skis and tourers better than the Freerides. Others will disagree. this is just my opinion.
Only real issue is that the binding only has 3 climbing position, instead of 4 like the FR. It isnt that big of a deal.
Touring has two pivot points which makes the stride very smooth. I like the feeling a lot. it makes switch backs super easy too.
IMO - right now, not including Dynafits, this is THE AT binding to have.
The Nx01 is the 12 din version, not as beefy. Some people have had durability issues with it, but those are mostly with the older models. Doesnt have the instatele issues like FR.
Silvretta Pure Freeride
Similar design to FR, except the pivot point is under the ball of the foot. Very light, almost as light as dynafits. Not as beefy as the FR or Nx21 from what Ive seen, but if weight is an issue and you want to use alpine boots this is the binding.
Dynafits
These are the best alpine touring bindings made. An issue with a lot of touring bindings is they sit very high off of the ski. These dont have that problem.
These bindings are extremely light, pounds lighter than the Nx21 and FR+. Touring is great, skiing is great. These bindings are actually the most laterally stiff of any AT binding.
Din to 10, but the binding can be locked down so it wont release (usually comapred to a din of 12).
If you are serious about touring, and you want the best, this is it.
Issues though....price. While dynafits can be found for similar prices, they are not compatable with alpine boots.
meaning, you need a seperate set of boots to use them. I find my alpine boots fine when touring, so no need to buy more.
But if you are getting alpine touring boots, consider getting ones the are dynafit compatable.
Another option is alpine trekkers. I call them Tour Wrekkers....
They DO get the job done. Mine broke after awhile, and touring on them isn't nearly as easy as on AT bindings, but they arent that bad. And you get to use normal bindings in the BC.
I have been fine on my Nx21 so no need for trekkers at the moment.
Basically, if you are looking at getting AT bindings the ones to consider at the Nx21, FR+, and dynafits.
The Naxo vs. FR battle has good points for both sides. I think the best way is to try and ski/tour on both and decide which you like more. I prefer the Nx21 though ;)