When I go to a slow speed track, like an autox or the Streets of Willow, I want the rear to really rotate. A stiff rear bar works wonders. But too stiff and it will rotate too much on the street. A too stiff rear bar will send your car to the salvage yard, just like many of the donor ITRs out there. The ITR rear bar is 22mm versus the GSR 14mm, and that allows the rear to really rotate.
Magazines love it.
They take it to the track, and turn awesome times. They proclaim it the best handling production FWD car ever made. Enthusiasts buy the ITR, drive it fast on the street and spin them into poles, embankments and guard rails. Its more difficult to compare the ST to the stock civic Si rear bar, because the geometry is different, but in its softest position it is noticeably stiffer than the stock bar. By moving the endlinks from hole to hole, you can fine tune the stiffness of the rear bar.