I have seen the original warband run a couple of times. In both cases, we were playing a Mordheim campaign as opposed to the Khemri campaign, and the TKs did not do at all well. Too slow, and as a result they tended to be shot to pieces before closing (they are scary, so they attracted attention from shooters).
In general with the three campaigns (Mordheim, Lustria, and Khemri) GW only play-tested the warbands for balance within the individual campaigns, not overall. They are not horribly out of sink, but the Lustrian warbands are a little more powerful than the Mordheim warbands, and the Khemri warbands are the weakest, in my experience.