i have the rubicon express lower control arms and they are just fine and the angle on my front diff are normal .

here are a couple pics of mine installed,, i had all j's put them in when they installed teh lift(litterally like 4-5?? year old frankenlift,, which i love,,
but OME shocks/struts were just a glimmer in the eye back then).. ranchos all around,, skyjacker rear coils, OME front springs?, etc...

the RE's are set to the same lenth as the stock arms on mine.... like others have said,, the rear suspension(boomerang,trilink)??? wont gain too much
from these, and theres no provision for the rear sway bar,, if you decide to put it back on some day.,, and you dont want to go longer cause of pinion angle??/
thrust bearings??

i think the best "bang for the buck" like what tommudd/tjkj said is just remove rear sway bar,, and its free. i didnt really notice much gain in articulation from stock kj arms to the RE's,, maybe some lateral movement,, side to side etc..

^^^^-----that being said,,, the only positives are:

1) RE arms are absolute beef,, look at the weeney stock arms,, are they even fully boxed?? or hollow?? you will NEVER bend one of these,, stock ones look
like they would bend like a taco..?? look at them side-by-side,, no comparison what soever...

2) greeseable heim joints???( <<-- is that what there called??) rebuildable if need be,, bulletproof,,

but ya,, all in all i cant really say $250 is worth it just for that..

like i said i lifted while ago , so correct me if im wrong or if things have changed.. sorry for grammer/punctuation/spelling