Havn`t had a problem with the progressive mono-tube front suspension kit i had fitted in the front of my Roadking , stiffens it up a bit and reduces the frontend diving under brakes and pogo`ing effect over rough stuff in bends , noticable difference and left at standard hieght !
I read they had probs with suspension `topping-out when they first released the kit , but i think it was to do with those that had the 1" lower install that comes with the standard kit , by memory it was $275 or something for the kit but + @ 4 hours labour or so to fit it ?
Havn`t had a drama with it what so ever in 3 years mate , but have also only ever heard good things about the racetech kits too hey !
Cheers