There is however a difference in the primera frame..right. I am sure that Primera has heat treated 700 series tubing and the rest (non s+s) are 853 air hardened. I talked to a C0-Mo guy with this exact concern and he told me the geometry is the same and assured me that the Primera frame vs the air hardened frames are indistinguishable it the way they ride. he told me in basic the Primera is a super duper mega strong frame that is not expected to fail. And the 853 chromo stuff is a super super duper duper mega with sugar on top strong fram that is not expected to ever ever dever ever fail. I also think there is a difference is weight. Obviously the big difference is the componentry. If money was not in question I certainly would have gone the better