Crazy thing, I was working part time at a running store when the nike rep brought the Terra in to show-and-tell. I got that shoe for $10; but, just too unstable for my foot, although the fit and feel were phenomenal. The Terra Trainer, on the other hand, was where Nike resolved the instability of the TC by firming up the pylon, putting in the heel clip that they still use today in the Infinity, and going back to an outsole of tried-and-true BRS 1000 rubber. Cool shoe. Great idea of bringing back the TC today w/ Zoom X.