I see from your profile that your XJ is a 99. I put this lift on my 01 back in oct. last year. I followed the forum here for about a year and a half plus read every shred of info I could get my hands on before spending any cash. I,m running adj. upper & lower control arms,full spring packs in the rear and Rancho 9000 shocks. The ride is every bit as comfy as it was before even with the shocks set at med. The flex is great for an off the shelf item. The RE kits tend to run higher in the rear, looked like a stink bug till things settled. As it sets now, I have 3/4" poly spacers for the front that will level it out for the most part. It may still be a little taller in the rear but should sit fine with my gear in the back. I did do a HD SYE and new rear drive shaft at the same time. (this seemed to be the safe thing to do) The sway bar disconects are a pain in the arse though. they are noisy too. One day I will change them out but they do the job. I run 31's on oem wheels anl only rub the fender near the top of the coils a little bit. I do need to trim my plastic bumper where the line of the flares is. Would I buy what I did knowing what I do now? yes. All in all it is a good value and a very complete package, IMO.