>I'm not up-to-date with the latest Logitech Bluetooth devices, but my general understanding is Logitech supplies a complete end-to-end software package/suite for all parts involved, and which is optimized for use with their hardware. If a Logitech tech support person tells you not to install that software, or the software is otherwise known to be buggy I suppose it should be avoided. But, it might be worth at least trying it - IME it uninstalls cleanly if it doesn't work and you need to remove it later.
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>My experience and opinion is that wireless devices (networking, keyboard, mouse) are inferior to their wired equivalents. If you want a reliable mouse for serious production work, get a wired unit.

The one I have is MX™ Revolution. The keyboard is Cordless Desktop MX™ 5500 Revolution. I never had any problem with the keyboard. I am downloading the SetPoint 6.15 software version 6.15.25. This is from 07/20/2010. The detail page is at http://www.logitech.com/en-ca/428/130?selectedcrid=428&selectedcid=130&WT.z_sp=Product&osid=14&bit=64.