Had a bit of a struggle with the bands, ordered my new watch on launch and followed the guide for size at the time which gave me a size 10. They updated the advice about checking the scale and the fit you should expect and it looked like a 8 was more suited but there was hassle first off exchanging straps without sending back the watch. The day I was in-store the advice had changed and I was able to exchange the strap only so I tried on different sizes in store and ended up with a size 7... 24 hours later I just found it way too tight, they were saying in store that over time they thought it would loosen up but I just didn't how it felt, it just seemed too tight so in the end I swapped again for a nike strap.
Happy now but I just didnt take to the sports loop on the wrist, I quite like the braided loop but stock is poop right now.
Got there in the end and the staff in the shop were really good, nothing was a problem and they just wanted to see me happy with the strap I settled on.