A couple of points and observations.
1. At any of the Marriott TS's that I've stayed at, you are required to wear a wristband, be it the traditional one that they supply at check-in or the optional RFID one, none of which are adjustable. At Ko'Olina, they walk around with wristbands and if you aren't wearing one they hand you one and make you put it on. In Aruba, I was stopped because they thought I didn't have a wristband on, but at the time I had it on my ankle.
Guess I won't be going to Ko'Lina or Aruba
2. Just for reference for anybody concerned that the wristbands might be too tight. I'm 6' tall and weighted in at about 180 lbs at the time of our trip. The wristband was a little loose around my wrist. My wives son is over 6', weighs about 250/260, wears size 36/38, and is very muscular: he had no problem with the wristband being too tight.
6' 1" 230, it's tight.
3. At times, it could be a pain trying to use the RFID band to enter the room or open the parking garage gate trying to angle your wrist so that the front of the RFID is parallel to the reader on the lock, especially if you let the RFID device rotate to the inside of your wrist, which is where I usually kept it on my left wrist along with my watch.
Well we agree on something.