13534832:Dirty.Harry. said:
Independent of cost, the SI&I is much better than the Guardian in my opinion. I was initially interested in the Guardians when they came out a few years ago, but after seeing them in action on friend's skis and using them myself for a couple days I do not like them any more.
SI&I:
Pros - Better downhill binding (Pivot/FKS, or whatever other binder you want), MUCH better touring with Dynafit toes, durable as whatever alpine binding you use.
Cons - Insanely expensive(see below), heavier than Dynafit/tech or alpine bindings only, need touring boots or toe conversion, have to carry extra toe in backpack to switch modes
Guardian:
Pros - Simple design (no switching toes), cheap (especially on used market)
Cons - Not designed for rubber touring sole block, no flat touring mode (gets uncomfortable and tiring on long flats), high riser has a tendency to fall and cause binding to lock into ski mode (this happens way too often), heavy for both touring and skiing, durability issues in early models
Here's a cost breakdown of the CAST Touring setup. Prices are from their website, so you may be able to find some parts cheaper:
275 - CAST plates
150 - Boot conversion
180 - Dynafit toepieces
150-250 - Alpine binding (depends on model)
755-905 estimated total (for JUST a binding setup...WTF)
Obviously you could eliminate some costs: already owning compatible alpine bindings, owning boots with swappy soles (i.e. Cochise boots), finding cheaper Dynafiddle Rad toes (hard to do...extra Dynafit parts are usually hoarded by people like me). That could easily cut your costs to below the 500 mark, but that's still pretty expensive compared to most framed touring bindings.
Instead of all of this, I recommend looking at the Tyrolia Adrenalin or Ambition. The former comes in DIN 13/16 and the latter in 10/12 options. It's a lot like the Marker Tour/Baron/Duke lineup. I've skied all the framed options in the past few years and the Tyrolia choices seem like the best option at the moment. They're also marketed by 4FRNT, Head, and Fischer. They are all identical.
I hope that all helped.