I think most 600s have 1.25 inch tracks vs 1 inch that may be on your 700 and I've heard the newer Polaris speedometer is much more accurate than the older ones. Stock for stock I don't think you will notice much difference between the two power wise.
From a power standpoint you will not be disappointed...this machine easilly lifts the skis...even with a 1 inch track. I have raced a few sleds and had no problem beating them.. Stock F6's and F7' (with mechanical reverse)...again similarly equipped. The FST 750 will beat it in takeoff..until you hit a little powder...then they begin to bog down in the snow. (It could be the weight differential)...(this comparison is in reference to a 06 FST switchback)
This machine rocks. The front suspension is much improved over the trailing arm suspension in my old SCSP , and in regards to speed...again I do not have studs, and on a snowy trail...I have consistently gotten over 90MPH... It would be interesting to stud the track and take her on a lake, or a frozen snow-covered road....
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