I have been using the Sportcuf and it works great. Not only does it prevent annoying movements or rotation of the instruments (computer/ bottom timer/compasses), but it also prevent the loss of those valuable and crucial instruments, underwater, and at the surface while taking off our pack before getting back in the Zodiac.
I know some divers that have lost previously their instruments in caves and deco dives and they all told me that their level of concentration lowered down considerably after realizing their loss.
As for those replacing the bracelet their bottom timer with double bunggies, I'm one of them. However, it does not always prevent rotation or possible loss, it only minimise it. I would also add that not all divers will want cut off their computer bracelet straps (ie Suunto computer) and replace them with bunggies.
