MS Bluetooth Intellimouse vs.Logitech MX900
Howdy again,
These are my personal & quite amateur comparisons of the MS Bluetooth Intellimouse & the Logitech MX900. My primary grading criteria is seamless integration. Second is fit & feel. Both work, though I think the MS mouse is the winner. The MS mouse is able to stay consistently connected thru the laptop's sleep mode & re-awakening; with about four seconds jiggle the mouse is active on the XP login screen. The MX900 generally stays similarly connected, but is more inconsistent – after some sleep mode sessions I found myself selecting >Bluetooth>Search for Devices>Connect… etc.
I DO have a pointer sensitivity issue to work out with the MS mouse. I installed IntelliPoint SW. I increased the sensitivity in >Control Panel>Mouse>Pointer Options, however, upon reboot the sensitivity is reduced to default. I uninstalled IntelliPoint SW – no change. As if trying the same thing would bring a different result, I again installed IntelliPoint, but no improvement. Using XP Pro SP1. Suggests for a fix & comparisons are very welcome.
The MS mouse is larger, and since blue is my least favorite color, uglier. The MX900 definitely pairs cosmetically well with the Dell grays. The MS seems to fit my hand very well, the matte texture seems good for grip, and the bigger browser buttons are more useful. Bear in mind that I have large, thin hands that can span an octave on the piano.

The MS Mouse is about 5mm higher, 5mm shorter, and 7mm wider than the MX900:

Neither have an 'off' button: the designers knew that these things were too big to lug around vs. $.25 switch (a big bucks in electronics).
I did have the 'Discovery' screen disabled once but am using:


Obviously the settings on these two screens seem to be in conflict.
Both Mice work; it just seems that the MS Mouse connects more automatically. I notice a plethora of MS Bluetooth Mouse/Keyboard combo units in OEM packaging for sale on eBay for the cost of retail-priced MS BT Mouse.
I might pick up a Bluetake / Thermaltake BT mouse for travel when I’m feeling flush.
Ralph