I am running a 2 year old RC 4" lift with no issues.
Had a bad spring in the first month took pictures and measurements one e mail one phone call new spring on my doorstep 3 days later.
The new one looks good so it shouldn't be an issue.
Have ridden the trails in JKs and TJs but not another YJ so as far as rough or smooth ride in mine no experience to compare to.
We beat this question up about every two months.
Your Jeep make it yours and have fun. Parts are parts.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184