I'll let you know in 5 years if it was worth the extra cost--what I am looking for is no rust for a long time. Perhaps it is most cost effective to buy three sets of the Costco ones for the price of one set of the McGard brand. But, if they are the standard cheap chrome, then they will slowly rust over time and then you have to decide when they finally look bad enough to bother replacing.
Kind of a dumb thing to worry about, but we all have issues...
Derek