Pros: These bars look better than pucks and they eliminated my vibes.
Cons: The supplied bolts are hex head (I DID NOT USE THEM)
Comments: I have the RC 2.5'' kit and had no vibes until I added my spring spacers. These bars from Skyjacker fixed my problem and I have no vibes with 3.5'' inches of lift.
I got the kit for 2 - 2.5'' inches of lift because I knew I only needed a little drop. I probably could've used washers, but I'm happy with this kit. The bars are 1'' thick and they are sized and tapered specifically for the passenger and the drivers side.
Installation is fairly easy with a floor jack. You may have to do some wiggling to get the bolt holes to line up.
They come with stupid bolts with a tiny little hex head which I did not use. I used the big, lug-nut looking bolts supplied with the RC TC-drop pucks and I zipped them up with an impact.
A word of advice: This kit comes with a drop bracket for your shifter linkage. I would STRONGLY recommend going through your gears and shifting into 4WD before installing this bracket. It is a MAJOR pain to install this because of where it is. I installed this bracket (took forever with lots of blood and grunts) and then my Jeep would not shift into 4WD at all. I then had to take it off and put everything back to stock (took forever with lots of blood and grunts), and everything works perfect.
These bars could easily be made by someone with access to the materials and tools.
This kit solved my vibes and I am happy with it.