Jelopster
I don't think I've seen any large retailer that even comes close to Costco for Customer Service. They are definitely leaders in this regard .
Lets not forget that selling clubs is not something new for Costco, they have been doing it for years. A quick look shows they have several Callaway sets, Honma and Cleveland Clubs, Nancy Lopez and even Bettinardi putters....in addition to their Ksig wedges and putters .
I'm expecting the irons to be successful just as their wedges and putters which they reportedly knocked it out of the park with. And.....if they aren't, well Costco has a value of over 200 billion, about 65x that of Taylor Made or any of the other golf club companies, they will just move onto the next thing and it won't mean a thing.
As for the hollow body Design, I think there are probably many reasons they chose this route, with the main one being it's a design ( if similar to the other same clubs out there ) that offers up big distance, good forgiveness and a clean look. This will appeal to a wide segment IMO. A pure blade or a pure shovel would not. They also have several cavity back sets being sold already so these will not overlap with those models.