I just got the 2011 Trivents. I have the Sworks shoe as well. The Trivent feels a tiny it smaller than my 2010 Sworks shoe. At first I thought they were too small but now that I’ve worn them for about a month, they seem to fit well, just needed a it of break in perhaps.
Remember that the S-works was made with the thought that you’ll be wearing sock…maybe even padded socks. The Tri-vent (I would assume) is made with the presumption that you won’t be wearing sox. Just sayin’…that might account for the slight variance in sizing.