Fellowes Mini WebPro Optical Mouse?

[NuovoTech]

Anyone own this or the WebPro regular size mouse made by Fellowes? Had a specific question: does the scroll wheel control an on/off switch when you push down on it like most other scroll wheel mouses? I want to buy 1, but heard a rumour that there was no such switch under the scroll wheel...

 

[NuovoTech]

Anybody own 1...how well do they work? Do you really need any extra SW to get it to work in XP?