@Pierre Welcome to the fold!
That is a nice discount for six-months. I don’t think that was running back in May. I used the rational that I am using the money I would spend on gas and tolls driving to the office. I think I have also used that money to buy a new helmet, a jersey, a couple pair of socks… oh, well.
I think near the end of the subscription you just renew/ extend. These are version three of the hardware. The firmware has been updated a couple of times since May so I think you will just keep what you have.
I do not have experience with wearing on the upper arm but I have been considering trying it. I started wearing a watch when I was 12. It got to the point I felt naked without it. It was more noticeable to me to go with out something on my wrist than wearing my wedding ring (my wife notices that of course!).
So, once we were all working from home I stopped wearing my watch. The Whoop has replaced it. But I can see some possible advantage to wearing on the upper arm especially while sleeping. Let me know if you try.
I am starting to look at HR and calorie burn comparisons across the various platforms I use. Will post my findings in the coming days.
I am interested to hear about your experiences.