Conclusion: I just received the Sonocaddie V-500 for a Christmas Present. I live in Minnesota, so didn't get a chance to use it until this June 2011. The one really only good thing about the product is that it is accurate. Besides that, the product clip used to hold the product on SUCKS!!! You have to make double sure it snaps onto the GPS properly, otherwise it will fall out. This happen to me 6 times in the first 3 times I used the product.
Summary: Loved this thing until my sixth round playing with it, 16th hole, sitting in the golf cart, one leg in the cart, the other leg on the grass. It slipped out of my hand and rolled down my leg, rolled off my foot onto the grass. That jarred something loose so it won't stay on. My fault? Yes. Could it be a little bit more rugged for outdoor use? Yes. I returned it for a full refund. I'll try a Garmin and see it it's better. Otherwise, awesome.