Have you ever used the female urinal device while hiking?

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We saw one on REI's site last night and it looks pretty cool, but I'd like to hear from anyone who has used one. They had some reviews on the site, but I don't know if they are paid reviews or what. It sounds like a good idea. I love hiking, but hate having to "go" in the woods. If it works like they say on the site it might be worth it, at least for peeing..lol. So, has anybody tried one?