In my case I'm only going to be running a 31" tire, with 2.5" suspension lift (H&R Springs and 1" billet spacer), 1.25" BL, Savvy arms, and a Savvy UA. Given the 31" tire, I'm looking to get the tie rod up out of harms way.I rarely do the flips anymore due to the bumpstop extension it requires to clear components with the aftermarket track bars, especially jks. if you are on a low lift 33" and under tires, basically stock control arm length and still using a stock track bar its a great fit.
control arms longer than 16.25" have pitman arm interference with the tie rod on 2" bumpstop extension, flipping it 3" higher adds even more. don't expect to be able to just toss it on and go!
guys running the 17" collapsed shock lengths that let the coils fall out on the droop end, don't have much to worry about.
Don't know if it matters or not yet, but I'm also running a ZJ conversion.