I originally ordered a 256 GB, 33W M, delivering in March. Out of curiosity, I tried resizing to see if it was accurate, and I got 512 GB 21W M, for pickup on Feb 3. I pulled the trigger, but now when I check my size, I keep getting 33W. I also have a pretty big head, so I am guessing the 33W is accurate. I really hope the exchange process is seamless, in that they have other sizes readily available for those picking up. Otherwise, are we going to have to order a different size and send back the band that came with the device, dealing with the snug fit in the meantime?
Since store pickup was the "recommended" option upon purchasing, I am assuming Apple is ready for this...