MEGAMAN  This last version is buggy for me.

Whenever my Mac goes to sleep, I loose all bluetooth functionality of both keyboard and mouse - requiring a re-start (sometimes several).

It's a pity as it now renders it useless for me.  
(Version 4.0.2)

STRYCH9  Great tools, required with slow apple mighty mouse.  
(Version 4.0.2)

PEDRO FARDILHA  A really good mouse driver.

Actually, the best I could find for my old Logitech VX Revolution.

It's just to bad it doesn't see all the buttons on my new Logitech Marathon M705.

To the author defense, I do believe that logitech is using some vendor-specific behavior on that button.  
(Version 4.0.2)

DLWHITE  Has anyone tried this dev's new Magic driver for Apple's Magic Mouse? It's supposed to add tons of customization, new swipe and tap capabilities, etc. It's still in beta, but USB Overdrive hasn't released anything yet.  
(Version 4.0.1)

MACD  I used this software for my Logitech Revolution mouse, and it worked OK. At least better than Logitech's own crappy drivers.

However, every time my Mac returned from sleep, it lost its settings. I have emailed the author, and got a response that it is a known problem, even received some script I was supposed to launch in order to reload drivers after sleep. The problem is, the script almost never worked. Had to unplug and plug the USB dongle every time.

This is a 1.5 years ago story. The problem exists this long, and it never was fixed. Author just doesn't really care it seems.

Recently though, I have purchased Kensington's Expert Mouse trackball, which comes with its own set of drivers. Installed them in addition to SteerMouse, and now when using the trackball, the cursor started to suddenly jump around.

Long story short, tried to replace SteerMouse with USB Overdrive, and the problem gone!

Now, I have switched to USB Overdrive completely. It is better software with more responsible developer and less bugs. And it doesn't conflict with MouseWorks driver for my trackball.  
(Version 4.0.1)

MAC007  I've got to say this is a great little program with just one little quirk. Whenever I restart my MacPro the left, middle, right, and button four on my Logitec mouse work as I set them but the rest don't work at all. The only way to restore them to active status is to reinstall USB Overdrive and then the buttons work just fine. I then turn off USB Overdrive or deinstall it until I restart the MacPro again. A very strange symbiosis if you ask me.  
(Version 4.0.1)

F451  For those who have been inquiring about Apple Magic Mouse support the developer has posted the following on their website:

"The Apple Magic Mouse significantly differs from general mice. Unfortunately, SteerMouse is not able to support it. We are now developing a driver especially for the Magic Mouse. It will be released as a new product and available from this December. We are very much looking forward to this release."  
(Version 4.0.1)

GURUBEZ  I ve been using this Software for several years and its outstanding!!

The support and the easy of use....

really great...  
(Version 4.0.1)

MEGAMAN  Overall, works ok.

A bit bummed about some of the Logitech mice constantly requiring 'reconnection' to keep all buttons mapped.

Also, since V4 my Mac won't wake from sleep (i.e. if I put it to sleep manually either by selecting sleep from drop-down menu or via sleep button on my keyboard) - forcing me to do a restart. Not happy about this so I've uninstalled it and now using USB Overdrive until this bug is fixed.  
(Version 4.0.1)

MACINTOSH90  I just found another setting that will be fitted for most everybody.

Tracking Speed at 0.125

Sensitivity at 100

Give it a try!  
(Version 4.0.1)