This forum is a wealth of information. I so appreciate being able to read and learn form all of your responses to other's questions. 
I haven't found much educational info in the forums specifically about bindings though, so I have a couple of questions.
I think I have seen the Volkl Fuego advertised with both the m11tc and m12tc Marker binding. Is it common to see integrated systems with more than one binding model available?
Other than the m12 accomodating a heavier skiier are there other significant differences in the two?
Also, what is a "railflex" binding and which manufacturers make them? Advantages?
Thanks in advance

I haven't found much educational info in the forums specifically about bindings though, so I have a couple of questions.
I think I have seen the Volkl Fuego advertised with both the m11tc and m12tc Marker binding. Is it common to see integrated systems with more than one binding model available?
Other than the m12 accomodating a heavier skiier are there other significant differences in the two?
Also, what is a "railflex" binding and which manufacturers make them? Advantages?
Thanks in advance