The SuperCharger was set up with a Marker MX-Cell 12TC system. I did note early on that the ski would be available foat because that is what was in the brochure but as with many things, there is change. K2 will only be offering the ski here with the MX-Cell 12 TC. This is not a compromise in any sort. While I and others have been somewhat critical of some Marker bindings, the MX-Cell is a fine choice and workds very well. I do like the work drive for adjustment, while it is not as easy as some bindings that have a quick finger adjustment, it does create a stonger interface which gives the SuperCharger a solid feel. The Marker system here also has a 0* ramp angle.
The SuperCharger v. the Rally: first of all there is a significant difference in turn radius, the Rally (in a 177) is about a 15M TR and the K2 is a 16.5M, this can be felt for sure, the Head wants to make short to medium turns where the K2 is more comfortable with medium to longer turns. One is not better than the other, just different. I did find the K2 to be a bit smoother too. Your concern with the shovel is warrented but not a detrament to the iRally, just inherrant in it's design, great if you want to be makign short to medium turns.