Update on this set:
Take note, MAC cannot produce 1/4" extensions worth of ****. Of this brand new 5-piece set, I have found that 3 of them are bent from the factory (6", 10" and 14") enough that you can see it bowed out while using them and, additionally, one (6") also has a defective ball detent that won't accept a socket no matter how much force you try to use. The bend is significant enough on the 10" and 14" that they won't even roll on a flat surface without bottoming out.
I understand that manufacturing defects happen, but 3 extensions bent and 1 completely unusable out of brand new a 5-piece set is pretty piss poor quality control. I guess I got lucky that the 5-piece 3/8" set was flawless, but yeah, stay away from these in 1/4" apparently.
Going to track down a MAC guy to attempt to warranty these out in person, because I have zero faith in a mail-in exchange if the odds of a factory dud are this ridiculously high.
Update 2:
So much for locating a dealer. I called MAC Tools and waited on hold for ages only to get a customer service rep that informed me of their latest dealer locator policy. Get this, they claim that so many dealers have been attacked and beaten, robbed or worse, that they no longer give out dealer contact information, even to new shops. Literally will not give out a phone number. "It's a liability issue for MAC tools," was all they'd tell me. I asked how all their competitors are able to give out dealer info, but they had no response. There is a dealer route management team you can appeal to, but no way to speak to them by phone, and they don't take inbound email, so you have to give the customer service rep your email to forward along, and hope for a reply "in a few weeks." I told them their policy was pure insanity and just hung up.
I'm going to toss the broken extension, relegate the bent ones to beater duty and already ordered something else. Will post that up in a few days when it gets here.