Here is a little more information....
These have the zerk fittings and I found it easier to grease the links before putting them on. The WK1 links did not have fittings and would tend to squeak. The fronts are side specific, so take your time and make sure you have the correct one for the correct side.
As for the handling, with four 12" wide tires on the WK2... the Jeep tends to track ridges or low spots in the road as well as expansion joints on the freeway. With the new links, this has been greatly reduced. Is it completely gone, no... but 80% reduced. Again, well worth it.
Any specific questions, let me know.