I have the VIO POV 1.5. It's a great unit. I've taken it down the Royal Gorge about a dozen times this year and once on Browns and Parkdale.
but--- The water proof bag that you can buy ripped at the seams on the 2nd day after about 5 hours of total use, and now leaks like a sieve. I've taped in up the best with marginal success. The unit by it's self is rated waterproof to a couple feet, so a leaky bag should still suffice, but I hope that VIO will warranty the bag.
ps.... If you come across a bomber secret to keeping water drops off the lense let me know. I've found that stopping to clean it every 20-30 minutes and a big splash of water helps to keep most droplets rolling off.
"So in two seconds, away we went, a sliding down the river, and it did seem so good to be free again and all by ourselves on the big river and nobody to bother us." -Mark Twain (The Adventures of Huckleberry Finn)