It is a
I don't know why but my girlfriend got dizzy and car sick when riding with the set of springs. Which is quite strange cuz neither me or my friends felt it. So I just swap back to factory myself. But it is a stiffer spring and awesome for track day or autocross
You can go check on the 27won website for details, but I think it is not too bad. There are definetly added vibrations, which is fine with me, but sadly not with my girldfriend.