Replying to Salomon Propulse Bindings

Does anyone know anything about Salomon propulse bindgings?

I have some s900 bindings that are a few years old that have the propulse technology. The bindings are pretty much like normal salomon 900 series bindings, but they have this riser that goes down between the heel and toepiece. The brake is built into this riser (there is a hinge in it and it goes flat when you step into it.

The thing I am wondering is if I should use these on new 4frnts which I will probably get this summer, or does the propulse thing negativly affect the flex of the ski?

Thank\s

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Representin Hood at Mammoth