Vertical mouse: a cure for wrist problems?

Hello fellow techs

Due to the usuall wrist/shoulder problems associated with intensive use of mouse, I’ve been looking into ways to diminish my pains (literally…). I’ve come across something I’d never heard about: vertical mouses! Saddly, none of the local stores have any, so I can’t even grip one just to try it. Which leaves me with the option of e-buying one. But before I do, I’d like to hear opinions. Anyone uses such mice? Do you think it’s worth it? And if you do, which brand/model are you using (I’m a Logitech fan, but they have none)?