I've got the standard V3. Using it right now, actually. I love it. And while the V3 Pro is truly impressive, I...just can't stomach the price tag. And then to have to buy the dock separately, for another $60...ouchie. The "older" Basilisk Ultimate is definitely the better buy, especially now that it's frequently on sale. I've been considering picking one up because it has, for me at least, two HUGE pros over the V3 - the side paddle is removable and the scrolling is able to be more finely tuned via the little wheel on the bottom; these are both features I absolutely loved about my V2; when I wasn't gaming on it, I'd just take the paddle off and pop the side cover on, which made it more comfy for browsing. I do love the free scrolling on the V3 though - makes scrolling through pages a breeze!
Also
@pzogel , you kind of piqued my interest when you described who the V3 Pro is for:
I'm a 5'3" woman with 16.5cm length hands, which are considered "small", and yet I can reach all the buttons on the mouse just fine. So now you've got me over here wondering if I'm a freak or nature or something