I took the car out for a spirited run with some friends and blew the outer passenger side CV joint on my new (had them for quite a while) axle. Worked with my parts guy to get a replacement. It turns out that the 1LE axles are on galactic backorder......... So, I went ahead and upgraded to Z28 axles because they are available. While there I went ahead and upgraded to the Z28 hubs (25954415 / ACDelco RW20-119). Thx to AG1LE for the tip to search eBay, I got a fantastic deal, so changed all 4.
Discussion here
http://www.camaro5.com/forums/showthread.php?t=518429
There is a noticable difference in the hubs, but nothing obvious with the axles.