not true. the BC ER coilovers ive got in my 33 gtr are great, the valving is pretty spot on and the 8/6kg springs work well on the street.
also i love the handling of my car. its solid, almost heavy but the steering is very direct. and ive driven my my mates s15 and i wouldnt say it was a noticeable improvment. not sure how a gtst/gtt would stack up though