I've had the four for a few weeks now. I doubt it has an eccentric pivot, as it's a lockback design and might not benefit from it; moreover, it's a $55 knife--essentially a very nice Delica--so it's not going to have all the niceties found on a $120 Spydie.
I'm very impressed that you can get a VG-10 wharnie folder with the usual Spyderco touches for such a low price. The fit and finish isn't perfect--mine has a little FRN flash, there are spaces between the inlaid spider legs and the FRN, and the action is pretty stiff--but it's mostly nitpicking in this price range.
Some folks who don't get the appeal of the overall package would probably prefer to drop this kind of cash on a CRKT or something similar, but I don't think anyone really provides what the Centofante4 offers right now.