I love my open water swim buoy. It gives me a much greater sense of safety every time I swim, especially when there are boats nearby, because it makes me much more visible on the water. It also helps my swim buddies keep track of where I am, which is especially helpful during longer swims or in choppier conditions.
I also really appreciate the whistle that's attached to the buoy. It's reassuring to know I have a way to signal for help if I ever need emergency assistance or if someone else in my group does. While I hope I never have to use it, having that extra safety feature gives me added peace of mind every time I head out for an open water swim. I wouldn't do an open water swim without it.