PASCALFORGET  Yep... The driver have always been the issue with the PowerMate. Taught of reinstalling it to scroll down faster, and with 10.5.6 the pointer moves right (or left) when I scroll up or down. After a few rotations, the pointer moves out of the window (in my case, a Firefox page), and the scroll changes to volume up or down...

I'll hope for an update. Meanwhile, I'll keep using the scroll wheel on my mouse.  
(Version 2.1)

F451  For the life of me I will NEVER purchase another Griffin hardware product that requires software as Griffin NEVER stays current with the Mac OS at hand. 10.5.6 made this software wonky; time to again shelf both my PowerMates.  
(Version 2.1)

TANKKNIGHT  I have loved this since it first came out and I had even pre-ordered my first silver 'mate. I eventually picked up 3 black 'mates and sold my silver. When version 2 came out I had a blast playing etch-a-sketch and programming the 3 'mates with many commands. For the last six months I have been using 2 KVM switches so I can use my 4 monitors between my Mac and PC. My Mac kept losing control of USB devices when I switched to the PC and back. My EyeTV, Phonemate and IRed software would stop working and I could not even kill them with the terminal ... so hard shutdown. It was dumb luck that I finally noticed that no problems would occur until I used any one of my 'mates. I did a lot of testing to make sure I observed right and then removed my Powermate software and unplugged all 3 'mates. I miss the 'mates, but it has been 1 month since the removal with no USB problems showing at all, no matter how many times I switch back and forth between the Mac/PC.

I am giving this 1 star for the headaches it caused me and because lately I have become very tired of software that makes me feel that I am at work (I am application support on window PCs, window Servers and Mainframe ... we've lost many IT people and not replaced).  
(Version 2.1)

GEORGE PAPHITIS  I tried to upgrade from ver. 1.6.4 on an Intel iMac running OS 10.4.10 Inspite of removing older version and deleting the preference file I could not get the newer version to display Global Preferences in the Preference Pane menu. The only function turning the Powermate was to change system volume. I could not scroll in web browser. In addition, this version does not support Unsanity's Cee Pee You. I reverted back to ver. 1.6.4 and all is back to normal again. As they say: "If it ain't broke don't fix it!"  
(Version 2.1)

SMACTRON  It looks like the last three beta releases have had the same release notes. What is truly different in this release?  
(Version 2.0b20)

MARS919  Definitely a lot better than previous versions! Nice and clean interface, works stable for me.  
(Version 2.0b19)

SJJ_PUBLIC  "Added support for multiple users". Wow! It only took them 3+ years to do it (multiple users/fast user switching was added in Mac OS X 10.3, released on Oct 24, 2003)! I can't wait for their compatibility fixes for Leopard, 10.5, to come out in or 2010 or 2011, perhaps just prior to the release of Mac OS X 10.7!  
(Version 2.0b18)

HANGON  Worst piece of software EVER.

The only hardware that makes Kernel Panic.

can't get the powermate to work with this driver or with their other software: proxi  
(Version 1.6.4)

SOLEFALD  PowerMate worked less than a minute. By worked i mean the blue light came on, blinked couple of times, and everything went dark. After that i am not able to get it for work at all. Rebooted, reinstalled the driver, plugged into another USB port.

All i get in the log file

griffin_PowerMateUSB[0x469e500]: message - service is requesting close

griffin_PowerMateUSB[0x4c18400]: message - service is terminated - closing down

griffin_PowerMateUSB[0x4c18400]: message - service is requesting close

USBF: 670.200 AppleUSBHubPort: Port 1 of Hub at 0x3d000000 reported error 0xe00002ed while doing set feature (resetting port)

(106: coreservicesd)tfp: failed on 0:

griffin_PowerMateUSB[0x4c18100]: message - service is terminated - closing down

griffin_PowerMateUSB[0x4c18100]: message - service is requesting close

USBF: 1266.529 [0x418f700] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 1 of hub @ location: 0x3d000000)

USBF: 1266.529 [0x418f700] The IOUSBFamily was not able to enumerate a device.

griffin_PowerMateUSB[0x47e1400]: message - service is terminated - closing down

MacBook Pro/10.4.5/PowerMate Driver 1.6.4

what a waste of money.  
(Version 1.6.4)

BILLKLEE  Great piece of hardware, mediocre piece of software, at best.

Instead, if you've got a PowerMate, I suggest using ControllerMate to run it.

On the plus side, you can set key-modifiers (shift-right, option-left, command-click-right, etc) and it doesn't have the "I'll work when I feel like it" functionality of the PowerMate driver.

On the down side, I haven't been able to get it to scroll, and the developer tells me CM doesn't support that very well at this time.  
(Version 1.6.4)