those snaps are designed to make switching lures easier, even though they rob them of 50% or so of thier action. The also reduce line twist on inline spinners, etc.

heres my take on fishing carolina/texas style. If I'm fishing specific peices of cover, its the texas rig. If I'm fishing structure in over 10' of water, its the carolina rig. 99% of my senko fishing is done wacky style.

And Chuck, technically thats not a carolina rig. Its just a pegged texas rig. The carolina rig consist of a small swivel, with a bead or two between the knot and bullet weight. It does make a difference, and will attract the fish.