When I bought my 9wt TFO this past fall there were two versions: the 2pc, which was $89, and the 4pc (3pc?), which was about $150. I asked about the price difference and was told that the more expensive rod was made with higher quality components. Another difference was that the 2pc had a glossy (lacquered?) finish and the other had more of a matte or brushed finish. I was also told that the action was the same for both rods.
FWIW, I bought the 2pc and am very pleased with its performance so far.