I have been using the Omnipod for two weeks now. One of the main reasons for me to choose the Omnipod was the water-proof feature. I practice Underwater Hockey (wikipedia, pictures), and one of my concerns was how well would the pod stay when I practiced the sport and where would be the best location for it.
After testing wearing the pod during practices I tried the back of my arm and my upper glut, as it would be hard to help secure the pod anywhere else. For the arm I used an ace bandage to wrap around the pod and then duct-taped around the bandage. This setup provided enough comfort and stability during practices.
As I was preparing for my first tournament with the pod (8 hr for 8 games, at 20 min-30 min per game, in one day) I chose to try the pod in the upper glut, as the speedo would hopefully keep it in place. I decided to use a primer for the adhesive (Mastisol) and played my first game. Unfortunately after the first half of the game a fin got snagged on the protruding pod and the pod came off. After the game I quickly primed a new pod, and decided to use the back of my arm again, with the ACE bandage trick and wrapped all with enough duct-tape. It proved effective and I am pleased that even without the Mastisol priming, the sticker stayed (for the most part) in place.
So far I feel the pod is what I needed, in the unlikely event that one of you also plays UWH, I hope this is useful for you.
Do you have tricks for contact water sports with the pod?