not sure where your info came from but ive delt with both and can say the exact opposite between rough country and rustys (have never delt with rubi express). as far as the ride on a rough country lift i have there 6" long arm on my lj and i would say the lift is great but there 2.2 shocks do firm it up a bit. i used there 6.5 on a 95 xj i had and thought it rode great and performed very well the couple times i had it off road but that kit used there standered shock. my dad has there 4.5 kit on a 2001 xj and he thinks its great and hes old so