Those are some of the most blingtastic LCA's I've seen. Doesn't necessarily mean they are well engineered, but they sure do look nice.
Do you want bling or performance? LCA's like those with poly on both ends will introduce bind in the the 3-link's articulation. The bind will also lead to rather quick failure of the poly bushings if you do any corner carving. Been there, done that with a set of poly/poly tubular LCA's before I got a set with a rod end on one end.
If you want performance, go with something that has a rod end on one end, or better yet for a street/track machine, one of the UMI LCA's with the Roto-Joint (basically a rebuildable rod end with delrin races that are supposed to quiet things down a bit).