i'd like to post my own experiences with the JKS quick discos for anyone who's interested...
while connected, the discos cause a rattle/thumpy sound over slowish bumps, potholes, etc... they don't make a peep at highway speed. it's kinda annoying at first, but you get used to it... passengers may ask why your jeep sounds like it's falling apart, but oh well...
new years day run at hannibal rocks was the first time i've actually disconnected them... prior ot that i've read about the lanyard that holds the sway bar up being too short... i verified this on my own with the jeep up on jack stands and the suspension at full droop...
what i did was put a regular key-chain ring on the lanyard and hooked that on the "?" shaped retaining thingy (my own technical name for it)...
this seemed to have worked perfectly.... offroad handling was night and day with the front disco'd... very flexy... much smoother... loved it..
i'm not sure if i ever got full droop or not while off-road that day, but the trails were nasty... everyone commented how the 1-star trails at hannibal were more like the 2's and 3's at the original rockport... i was half expecting to find a snapped lanyard at the end of the day, but it was fine... never heard a peep out of the sway bar all day either, so it didn't come into contact with anything as far as i can tell.
all in all, i think the JKS discos are great... just wish they were a bit quieter around town...
Mark