I have a GT Sanction Pro, but I'm looking at trading up the the Spartan RR because the cockpit pit is so tight on the Sanction. I'm 5'7" and wonder what the plus/minuses are...
Remember the Spartan is tight as well. Never ridden a Sanction Pro so can't speak for it. I do have a Spartan other than being a tad heavy ( Aluminum frame with aftermarket rims and other bits and it weighs 30.5 lb)it is great and can handle any terrain. It climbs decent for a 160mm bike but descends excellent (everything including bike parks).