All the Elliptics I have tried feel virtually the same, I assume because of that tapered design. The grey/lavender Elliptic Comp (Kevlar/Graphite) has a very slightly softer flex that the version with SIC ceramics, maybe. Even the Elliptic Fun, which was a cheaper model, feels very close to the rest of the bunch.
Colpo, wasn't Chesnokov's frame an actual monoshaft? I recall that he only had 2 frames for the tournament and had to beg for a few more as he advanced into the draw. He switched to a Prestige 600 later in his career (at least for the Davis Cup match where Sampras cramped after match point).
I bought a few Twin Tecs from Colpo several years ago, but found them much stiffer than the Elliptics, which remain my favorite frames ever produced by Fischer.