I put a set of Reflexes on when I redid my XJ. I was really suprised ; those Reflexes ride smoother than the Sensa-tracs we put in my grandfather's Impala. I know, two way diferent suspension set ups but still, everyone is suprised by how nice the jeep rides with the reflexes, which, as far as I can tell, are billed as a rougher riding, quick acting type of shock. I highly reccomend the Reflexes, mine have the lifetime warranty with them too.
Edit: keep in mind that I have a stock XJ (no lift) with new slightly over sized tires (P235/75R15s) and the origional suspension (87 coils and leaves) and nothing else really done to the suspension.