OK, first everything that has to do with the mouse itself is outstanding. All the hardware is incredible. The reason I can't give 5 stars across the board is that Logitech Setpoint uses C++ 2005, code that Windows Vista 64 doesn't come with.
I got home, opened the box, plugged it in and thought I'd be good to go because I was using a VX revolution previously with setpoint. Unfortunately the new mouse wasn't recognized, so taking the recommended actions from Logitech, I uninstalled my current version of Setpoint so I could install it fresh from the disk. This is where the problems started, at about 90% complete I kept getting the same error message about the VC8 Libraries. So in accordance to the error message, I restarted the cpu and tried again, same thing.
Next I downloaded the Setpoint Installer from the Website, sadly, the same issue. Come to find out through VERY thorough searching on the internet, I'm FAR from the first person to have this issue. Matter of fact, the solution is posted right here on the logitech forums, but it's not directly referenced from the Performance MX troubleshooting page.
The least Logitech could do is CLEARLY point out that for the effected operating systems, you will need to download a few redistribution of C++ from Microsoft's website and present us with the link up front rather than after a frustrated hour of Google searches.
Better yet, include the redistribution with the software. Even better yet, update Setpoint to use the CURRENT version of the code so this is no longer an issue.
That said, now that my first extremely frustrating night with this mouse is over and done with, I do love it and Highly recommend it.
And for anyone that experiences the same VC8 Library error message I did, here is a link to the forum post you need, hopefully it helps you get going faster than I did.
Post #38 is the one containing the links to the required redistribution.
http://forums.logitech.com/t5/Windows-7-Discussion-Topics/SetPoint-4-80-is-Windows-7-WHQL-certified-and-available-for/td-p/369510/page/4
Technical Expertise: Tech Savvy
I've used this product: Less than a week