I used to have a 97 with the skyjacker 8"RR, and it was okay. All I have to compare it to was my RE 4.5' on my 96. The RR was a decent kit, but for offroading, a long arm kit would be better. I think the RR is only a short arm kit.
Either way, from my experience, I had problems with the joints going bad and making alot of noise for everyday driving. Also, the trackbar give me fits. If I remember correctly,it was adjustable, but even so, it was not enough. After the installation I had alot of work done to correct the 2" off centering of the front axle from that tracbar.
I may have had a unique bad experience, but that was my experience. Hope that helps! AAlso, I am currently looking for a lift of about 6" for my new XJ. I have been looking at Full Traction, Rubicon Express, Rockkrawler, and BDS. Others on this site have told me to also look at TNT Customs, and Clayton. Enjoy!!