The cruel Haemonculi use multifarious tools for torture and pain. Since Dark Eldar first got created in Warhammer 40k, Taloi and Haemonculi were a strong, but slow assault unit. One of my first additions in the 1990ies was a metal Talos. Thinking of assembling this bulk of pewter makes me getting nightmares and I definitely lost count on how many flight stands broke under it’s weight. In Epic, Taloi pain engines and their larger cousins the Perditors act as strong assault units. Fearless and toughly protected by 4+ reinforced saves, although with lower attack count, they can ruin your enemies day if he gets his units close enough to your webway portal. In my experience they are not worth taking unless you plan to enter the game via portal, as their slow movement makes them vulnerable to enemy shooting.
Aside of the old metal monster I had two modern plastic Taloi and a scratched Chronos in Warhammer 40k. Looking at the parasite rigs from Onslaught Miniatures, I am fully satisfied, how they encapsule the Dark Eldar feeling, without copying their counterparts.